| Note 5 - 2014 Junior Secured Notes Offering (Tables) (Director [Member]) | 3 Months Ended | ||||||||||||||||||||
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| Mar. 31, 2014 | |||||||||||||||||||||
| Director [Member] | |||||||||||||||||||||
| Note 5 - 2014 Junior Secured Notes Offering (Tables) [Line Items] | |||||||||||||||||||||
| Assumptions Used in Calculating Fair Value of Warrants Issued [Table Text Block] | 
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