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Note 10 - Share-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 29, 2020
Feb. 29, 2020
Jan. 01, 2020
May 31, 2019
May 17, 2019
Jan. 23, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Common Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.01 $ 0.01   $ 0.01   $ 0.01
Warrant Contra Revenue             $ 410 $ (0) $ 1,173 $ 730  
Chief Executive Officer [Member]                      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total             600        
Other Deferred Compensation Arrangements, Liability, Current and Noncurrent             450   450    
Share-based Payment Arrangement, Option [Member]                      
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount             1,012   $ 1,012    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)                 2 years 7 months 28 days    
Selling, General and Administrative Expenses [Member]                      
Share-based Payment Arrangement, Expense             238   $ 447    
Aegis Stockholder [Member] | The 2019 Equity Offering [Member]                      
Sale of Stock, Number of Shares Issued in Transaction (in shares)         692,520            
Sale of Stock, Price Per Share (in dollars per share)         $ 7.48            
CSP Victory Limited [Member]                      
Sale of Stock, Price Per Share (in dollars per share) $ 4.87                    
Stock Issued During Period, Shares, New Issues (in shares) 1,540,041                    
Amazon Transaction Agreement [Member]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 4,006,051         4,000,000         4,002,964
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 9.94       $ 9.95 $ 9.96          
Class of Warrant or Right, Vested During Period (in shares)   212,953   212,766   425,532          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Expected Proceeds from Transaction Required for Vesting           $ 600,000          
Warrant Contra Revenue   $ 278   $ 730     $ 410   $ 1,173   $ 565
Amazon Transaction Agreement [Member] | Accounting Standards Update 2019-08 [Member]                      
Warrant Contra Revenue     $ (413)