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Note 9 - Stock-Based Compensation - Activity of Stock Option Plan (Details) - USD ($)
 12 Months Ended
Dec. 31, 2014
Number of Shares (in shares) 1,183,100
Weighted Average Exercise Price (in dollars per share) $ 3.50
Granted (in shares) 217,500
Granted (in dollars per share) $ 0.17
Forfeited or expired (in shares) (231,444)
Forfeited or expired (in dollars per share) $ 1.89
Weighted average remaining contractual period 6 years 219 days
Aggregate Intrinsic value $ 0
Exercisable at December 31, 2014 (in shares) 785,594
Exercisable at December 31, 2014 (in dollars per share) $ 5.09
Exercisable at December 31, 2014 5 years 73 days
Exercisable at December 31, 2014 $ 0