Note 10 - Stock-Based Compensation (Details)	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options Outstanding | shares	67,879
Option Granted | shares	1,000,000
Option Cancelled | shares
Options Outstanding | shares	1,067,879
Options exercisable at End | shares	354,911
Outstanding at Beginning, Weighted-Average Exercise Price | $ / shares	$ 21.40
Weighted- Average Exercise Price, Granted | $ / shares	1.75
Weighted- Average Exercise Price, Cancelled | $ / shares
Outstanding at Ending, Weighted-Average Exercise Price | $ / shares	3.00
Weighted- Average exercisable at End | $ / shares	$ 4.99
Weighted- Average Remaining Contractual Term, Beginning balance	7 years 2 months 1 day
Weighted- Average Remaining Contractual Term, Granted	5 years
Weighted- Average Remaining Contractual Term, Ending Balance	5 years 2 months 19 days
Weighted- Average Remaining Contractual Term, exercisable at End	4 years 11 months 12 days
Aggregate Intrinsic Value | $
Aggregate Intrinsic Value, exercisable at End | $