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Note 13 - Warrants and Options (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 314,218 234,218
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0
Non-Incentive Plan Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 323,498 323,498
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 21.84 $ 21.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 335 days 1 year 335 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 0 $ 0
Warrants to Purchase Common Stock [Member]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 728,583 728,583
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 6.18 $ 6.18
Warrants and Rights Outstanding, Remaining Contractual Term 3 years 4 years
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 3.27 $ 3.27
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 134 $ 134