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Note 9 - Activity of Stock Option Plan (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Number of shares (in shares) | shares 1,183,100
Weighted average exercise price (in dollars per share) | $ / shares $ 3.50
Granted (in shares) | shares 590,400
Granted (in dollars per share) | $ / shares $ 0.11
Forfeited or expired (in shares) | shares (68,000)
Forfeited or expired (in dollars per share) | $ / shares $ 1.50
Number of shares (in shares) | shares 1,705,500
Weighted average exercise price (in dollars per share) | $ / shares $ 2.41
Weighted average remaining contractual period 7 years 109 days
Aggregate Intrinsic value | $ $ 0
Exercisable at December 31, 2015 (in shares) | shares 906,761
Exercisable at December 31, 2015 (in dollars per share) | $ / shares $ 4.39
Exercisable at December 31, 2015 5 years 109 days
Exercisable at December 31, 2015 | $ $ 0