|
Note 8 - Stockholders' Equity (Tables)
|
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2014
|
Dec. 31, 2013
|
| Note 8 - Stockholders' Equity (Tables) [Line Items] |
|
|
| Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] |
|
Fair value at December 31, 2013
|
|
$
|
3,747,858
|
|
|
Gain on change in fair value of derivative liabilities
|
|
|
(578,179
|
)
|
|
Fair value at September 30, 2014
|
|
$
|
3,169,679
|
|
|
|
Balance at January 1, 2012
|
|
$
|
-
|
|
|
Fair value of July 2012 warrants at transaction date
|
|
|
1,957,720
|
|
|
Loss on change in fair value
|
|
|
170,582
|
|
|
Balance at December 31, 2012
|
|
|
2,128,302
|
|
|
Fair value of January 2013 warrants at transaction date
|
|
|
3,305,245
|
|
|
Gain on change in fair value of derivative liabilities
|
|
|
(1,685,689
|
)
|
|
Balance at December 31, 2013
|
|
$
|
3,747,858
|
|
|
| Impact of Conversions to Common Stock [Table Text Block] |
|
|
|
|
Impact to Balance Sheet
|
|
|
Increase in
|
|
|
|
|
Before
Conversions
|
|
|
Impact of
Conversions
|
|
|
After
Conversions
|
|
|
Common Shares
Outstanding
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Impact on assets
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Deferred costs
|
|
$
|
799,123
|
|
|
$
|
(799,123
|
)
|
|
$
|
-
|
|
|
|
-
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Impact on liabilities and equity
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Accrued interest on converted notes
|
|
$
|
974,311
|
|
|
$
|
(974,311
|
)
|
|
$
|
-
|
|
|
|
1,092,559
|
|
|
Summer 2011 Notes, net
|
|
|
904,397
|
|
|
|
(904,397
|
)
|
|
|
-
|
|
|
|
2,183,334
|
|
|
March 2010 Notes, net
|
|
|
4,057,500
|
|
|
|
(4,057,500
|
)
|
|
|
-
|
|
|
|
4,071,000
|
|
|
2011 Unit Offering Notes, net
|
|
|
4,367,482
|
|
|
|
(4,367,482
|
)
|
|
|
-
|
|
|
|
9,050,834
|
|
|
Total impact on liabilities
|
|
|
10,303,690
|
|
|
|
(10,303,690
|
)
|
|
|
-
|
|
|
|
16,397,727
|
|
|
Series A convertible preferred stock
|
|
|
7,965,000
|
|
|
|
(7,965,000
|
)
|
|
|
-
|
|
|
|
7,965,000
|
|
|
Additional paid-in capital and common stock
|
|
|
-
|
|
|
|
19,345,209
|
|
|
|
19,345,209
|
|
|
|
-
|
|
|
Accumulated deficit
|
|
|
-
|
|
|
|
(1,875,642
|
)
|
|
|
(1,875,642
|
)
|
|
|
-
|
|
|
Total impact on equity
|
|
|
7,965,000
|
|
|
|
9,504,567
|
|
|
|
17,469,567
|
|
|
|
7,965,000
|
|
|
Total impact on liabilities and equity
|
|
$
|
18,268,690
|
|
|
$
|
(799,123
|
)
|
|
$
|
17,469,567
|
|
|
|
24,362,727
|
|
|
| Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|
|
|
Shares
|
|
|
Weighted -
Average
Exercise
Price
|
|
|
Outstanding at December 31, 2013
|
|
|
7,430,225
|
|
|
$
|
1.47
|
|
|
Granted
|
|
|
417,000
|
|
|
|
1.05
|
|
|
Exercised
|
|
|
(162,500
|
)
|
|
|
0.88
|
|
|
Forfeited
|
|
|
(130,000
|
)
|
|
|
1.88
|
|
|
Outstanding at September 30, 2014
|
|
|
7,554,725
|
|
|
|
1.46
|
|
|
|
|
|
Options
Outstanding
|
|
|
Options
Exercisable
|
|
|
Range of
Exercise Prices
|
|
|
Weighted-
average
Exercise
price per
share
|
|
|
Intrinsic
Value(1)
|
|
|
Balance at January 1, 2012
|
|
|
3,679,977
|
|
|
|
|
|
|
$
|
0.88
|
|
-
|
|
$
|
9.64
|
|
|
$
|
2.05
|
|
|
$
|
-
|
|
|
Exercisable at January 1, 2012
|
|
|
|
|
|
|
1,501,659
|
|
|
|
0.88
|
|
-
|
|
|
9.64
|
|
|
|
2.15
|
|
|
|
-
|
|
|
Granted (2)
|
|
|
3,097,400
|
|
|
|
|
|
|
|
1.00
|
|
|
|
|
2.13
|
|
|
|
1.08
|
|
|
|
|
|
|
Exercised
|
|
|
(14,000
|
)
|
|
|
|
|
|
|
1.80
|
|
-
|
|
|
9.64
|
|
|
|
1.80
|
|
|
|
|
|
|
Cancelled or forfeited
|
|
|
(331,250
|
)
|
|
|
|
|
|
|
1.80
|
|
-
|
|
|
9.64
|
|
|
|
2.14
|
|
|
|
|
|
|
Outstanding at December 31, 2012
|
|
|
6,432,127
|
|
|
|
|
|
|
|
0.88
|
|
-
|
|
|
9.64
|
|
|
|
1.58
|
|
|
|
1,846,040
|
|
|
Exercisable at December 31, 2012
|
|
|
|
|
|
|
2,386,909
|
|
|
|
0.88
|
|
-
|
|
|
9.64
|
|
|
|
2.13
|
|
|
|
205,000
|
|
|
Granted (2)
|
|
|
1,219,500
|
|
|
|
|
|
|
|
1.09
|
|
-
|
|
|
1.75
|
|
|
|
1.43
|
|
|
|
|
|
|
Cancelled or forfeited
|
|
|
(221,402
|
)
|
|
|
|
|
|
|
1.00
|
|
-
|
|
|
9.64
|
|
|
|
4.33
|
|
|
|
|
|
|
Outstanding at December 31, 2013
|
|
|
7,430,225
|
|
|
|
|
|
|
|
0.88
|
|
-
|
|
|
9.64
|
|
|
|
1.47
|
|
|
|
1,493,368
|
|
|
Exercisable at December 31, 2013
|
|
|
|
|
|
|
4,416,292
|
|
|
|
0.88
|
|
-
|
|
|
9.64
|
|
|
|
1.68
|
|
|
|
566,589
|
|
|
| Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|
|
|
|
|
Options Outstanding
|
|
|
Options Exercisable
|
|
|
Range of
Exercise Prices
|
|
|
Number
Outstanding
|
|
|
Weighted -
Average
Remaining
Contractual
Life
|
|
|
Weighted -
Average
Exercise
Price
|
|
|
Number
Exercisable
|
|
|
Weighted -
Average
Remaining
Contractual
Life
|
|
|
Weighted -
Average
Exercise
Price
|
|
|
$0.88
|
-
|
$1.26
|
|
|
|
3,375,650
|
|
|
|
7.31
|
|
|
$
|
1.01
|
|
|
1,189,384
|
|
|
|
6.36
|
|
|
$
|
0.97
|
|
|
1.40
|
-
|
2.13
|
|
|
|
3,948,450
|
|
|
|
8.29
|
|
|
|
1.74
|
|
|
3,120,783
|
|
|
|
7.40
|
|
|
|
1.79
|
|
|
3.20
|
-
|
9.64
|
|
|
|
106,125
|
|
|
|
4.17
|
|
|
|
6.16
|
|
|
|
106,125
|
|
|
|
4.17
|
|
|
|
6.16
|
|
|
|
|
|
|
|
|
7,430,225
|
|
|
|
7.79
|
|
|
|
1.47
|
|
|
4,416,292
|
|
|
|
7.04
|
|
|
|
1.68
|
|
|
| Schedule of Nonvested Share Activity [Table Text Block] |
|
|
Nonvested Stock Options
|
|
Shares
|
|
|
Weighted -
Average
Grant Date
Fair Value
|
|
|
Nonvested January 1, 2012
|
|
|
2,178,318
|
|
|
|
0.87
|
|
|
Granted
|
|
|
3,097,400
|
|
|
|
0.48
|
|
|
Forfeited
|
|
|
(258,516
|
)
|
|
|
0.85
|
|
|
Vested
|
|
|
(971,984
|
)
|
|
|
1.04
|
|
|
Nonvested December 31, 2012
|
|
|
4,045,218
|
|
|
|
0.56
|
|
|
Granted
|
|
|
1,219,500
|
|
|
|
0.63
|
|
|
Forfeited
|
|
|
(94,833
|
)
|
|
|
0.76
|
|
|
Vested
|
|
|
(2,155,952
|
)
|
|
|
0.58
|
|
|
Nonvested December 31, 2013
|
|
|
3,013,933
|
|
|
|
0.52
|
|
|
| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|
Dividend yield
|
|
|
0%
|
|
|
Expected volatility
|
|
|
49.7% to 51.8%
|
|
|
Risk free interest rates
|
|
|
1.90% to 2.71%
|
|
|
Expected lives (in years)
|
|
|
5.5 to 6.0
|
|
|
|
|
|
Years Ended December 31,
|
|
|
|
|
2013
|
|
|
2012
|
|
|
Dividend yield
|
|
|
0%
|
|
|
|
|
0%
|
|
|
|
Expected Volatility
|
|
43.4%
|
to
|
46.0%
|
|
|
45.2%
|
to
|
45.3%
|
|
|
Risk free Interest rates
|
|
0.92%
|
to
|
2.10%
|
|
|
0.83%
|
to
|
1.13%
|
|
|
Expected lives (years)
|
|
5.0
|
-
|
6.0
|
|
|
|
6.0
|
|
|
|
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
|
|
|
Shares
|
|
|
Weighted -
Average
Exercise
Price
|
|
|
Outstanding at December 31, 2013
|
|
|
12,136,865
|
|
|
$
|
1.33
|
|
|
Issued (see Note 5)
|
|
|
1,190,250
|
|
|
|
1.75
|
|
|
Outstanding at September 30, 2014
|
|
|
13,327,115
|
|
|
|
1.37
|
|
|
|
|
|
Shares
|
|
|
Weighted -
Average
Exercise
Price
|
|
|
Outstanding at January 1, 2012
|
|
|
1,922,944
|
|
|
$
|
0.43
|
|
|
Issued
|
|
|
7,652,071
|
|
|
|
1.05
|
|
|
Shares withheld on net settled exercises
|
|
|
(186,347
|
)
|
|
|
0.70
|
|
|
Exercised
|
|
|
(624,832
|
)
|
|
|
0.67
|
|
|
Outstanding at December 31, 2012
|
|
|
8,763,836
|
|
|
|
0.95
|
|
|
Expired
|
|
|
(41,666
|
)
|
|
|
1.00
|
|
|
Issued
|
|
|
4,643,842
|
|
|
|
1.75
|
|
|
Shares withheld on net settled exercises
|
|
|
(101,318
|
)
|
|
|
0.85
|
|
|
Exercised
|
|
|
(1,127,829
|
)
|
|
|
0.08
|
|
|
Outstanding at December 31, 2013
|
|
|
12,136,865
|
|
|
|
1.33
|
|
|
| Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|
Three Months Ended September 30,
|
|
|
Nine Months Ended September 30,
|
|
|
2014
|
|
|
2013
|
|
|
2014
|
|
|
2013
|
|
|
$
|
192,001
|
|
|
$
|
345,632
|
|
|
$
|
555,909
|
|
|
$
|
988,223
|
|
|
|
| Common Stock Warrants Issued in Private Placement [Member] |
|
|
| Note 8 - Stockholders' Equity (Tables) [Line Items] |
|
|
| Assumptions Used in Calculating Fair Value of Warrants Issued [Table Text Block] |
|
Dividend yield
|
|
|
0%
|
|
|
Expected volatility
|
|
|
38.5% - 100.0%
|
|
|
Risk free interest rates
|
|
|
0.76% - 1.18%
|
|
|
Expected remaining term (in years)
|
|
|
2.76 to 3.32
|
|
|
|
| Private Placements [Member] |
|
|
| Note 8 - Stockholders' Equity (Tables) [Line Items] |
|
|
| Assumptions Used in Calculating Fair Value of Warrants Issued [Table Text Block] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Transaction Date
|
|
|
|
|
December 31,
|
|
|
January 2013
|
|
|
July 2012
|
|
|
|
|
2013
|
|
|
2012
|
|
|
Financing
|
|
|
Financing
|
|
|
Dividend yield
|
|
|
0%
|
|
|
|
|
0%
|
|
|
|
|
0%
|
|
|
|
|
0%
|
|
|
|
Expected volatility
|
|
40.38%
|
-
|
100.00%
|
|
|
|
47.08%
|
|
|
|
47.08%
|
-
|
100.00%
|
|
|
|
47.64%
|
|
|
|
Risk free interest rates
|
|
1.01%
|
-
|
1.27%
|
|
|
|
0.65%
|
|
|
|
|
0.91%
|
|
|
|
|
0.75%
|
|
|
|
Expected remaining term (in years)
|
|
3.51
|
to
|
4.07
|
|
|
|
4.51
|
|
|
|
|
5.00
|
|
|
|
|
5.00
|
|
|
|
| Director [Member] |
|
|
| Note 8 - Stockholders' Equity (Tables) [Line Items] |
|
|
| Assumptions Used in Calculating Fair Value of Warrants Issued [Table Text Block] |
|
|
|
Year Ended December 31,
|
|
|
|
2013
|
|
2012
|
|
|
Dividend yield
|
|
0%
|
|
|
|
0%
|
|
|
|
Expected Volatility
|
|
46.49%
|
|
|
40.96%
|
to
|
46.88%
|
|
|
Risk free Interest rates
|
|
1.38%
|
|
|
0.19%
|
to
|
0.77%
|
|
|
Expected lives (years)
|
|
5.0
|
|
|
1.6
|
to
|
5.0
|
|
|