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Note 11 - Subsequent Events (Detail) (USD $)
|
1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jul. 31, 2012
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Nov. 30, 2010
|
Jan. 31, 2013
Subsequent Event [Member]
Director [Member]
|
Mar. 06, 2013
Subsequent Event [Member]
The 2011 Junior Secured Convertible Note [Member]
|
Feb. 21, 2013
Subsequent Event [Member]
The 2011 Junior Secured Convertible Note [Member]
|
Dec. 31, 2012
Subsequent Event [Member]
The 2011 Junior Secured Convertible Note [Member]
|
Apr. 30, 2011
Subsequent Event [Member]
The 2011 Junior Secured Convertible Note [Member]
|
Jan. 31, 2013
Subsequent Event [Member]
|
Dec. 31, 2012
Subsequent Event [Member]
|
Mar. 06, 2013
Subsequent Event [Member]
|
Apr. 30, 2011
The 2011 Junior Secured Convertible Note [Member]
|
|
| Sale of Stock, Price Per Share (in Dollars per share) | $ 1.20 | |||||||||||||
| Stock Issued During Period, Shares, New Issues (in Shares) | 5,454,523 | 9,201,684 | ||||||||||||
| Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) | 4,600,842 | |||||||||||||
| Proceeds from Issuance of Private Placement | $ 5,516,495 | $ 5,516,495 | $ 402,000 | $ 11,000,000 | ||||||||||
| Warrants Issued During Period, Weighted Average Exercise Price (in Dollars per share) | $ 1.45 | $ 1.05 | $ 0.29 | $ 8.00 | $ 1.75 | |||||||||
| Payments of Stock Issuance Costs | 480,000 | 1,100,000 | ||||||||||||
| Contingency, Maximum Percent | 12.00% | |||||||||||||
| Loss Contingency, Range of Possible Loss, Maximum | 1,300,000 | |||||||||||||
| Warrants Issued During Period, Exercise Price (in Dollars per share) | $ 1.45 | $ 1.41 | ||||||||||||
| Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ 0.60 | |||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 3.50% | 10.00% | 5.50% | 10.00% | ||||||||||
| Debt Instrument, Face Amount | 3,000,000 | 4,289,444 | 2,000,000 | 2,000,000 | ||||||||||
| Interest Payable | 389,444 | |||||||||||||
| Addition to Debt Amount | $ 1,900,000 | |||||||||||||