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Note 9 - Common Stock, Treasury Stock and Warrants (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2017
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Jul. 09, 2018
Common Stock, Shares, Issued, Total   78,574,482   78,574,482 76,525,581  
Treasury Stock, Shares, Ending Balance   1,791,186   1,791,186 1,233,198  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation       557,988    
Treasury Stock, Value, Ending Balance   $ 6,368   $ 6,368 $ 3,272  
Class of Warrant or Right, Outstanding   2,398,776   2,398,776 2,498,776  
Common Stock, Par or Stated Value Per Share   $ 0.0005   $ 0.0005 $ 0.0005  
Reclassification of Puttable Option from Liability to Equity   $ 1,150 $ 1,150      
Whitehorse Finance, Inc. [Member]            
Stock Issued During Period, Warrants Exercise 300,000          
Amended Whitehorse Warrants [Member]            
Class of Warrant or Right, Put Price $ 3.8334          
Amended Whitehorse Warrants [Member] | H.I.G. Whitehorse SMA ABF, L.P. [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 3
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           46,667
Common Stock, Par or Stated Value Per Share           $ 0.0005
Amended Whitehorse Warrants [Member] | H.I.G. Whitehorse SMA Holdings I, LLC [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           66,666
Common Stock, Par or Stated Value Per Share           $ 3
Amended Whitehorse Warrants [Member] | Whitehorse Finance, Inc. [Member]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights           186,667
Common Stock, Par or Stated Value Per Share           $ 3
Minimum [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 3.75   3.75 3.75  
Maximum [Member]            
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 6   $ 6 $ 6  
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period       2,048,901    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation       557,988