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Note 5 - Computation of Net Loss Per Common Share (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 7 Months Ended 9 Months Ended
Nov. 13, 2019
Dec. 31, 2020
Dec. 31, 2019
Oct. 26, 2019
Dec. 31, 2020
Dec. 31, 2019
Nov. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   1,100,000     1,100,000    
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)   18,000   108,000  
Fair Value Adjustment of Warrants   $ 556 $ (4,648) $ 4,648  
Hudson Warrant [Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     818,181     818,181 58,823
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)     $ 7.81     $ 7.81  
Average Common Stock Price (in dollars per share)     $ 8.19     $ 9.29  
Stock Issued During Period, Shares, Warrant Exercise (in shares) 786,000            
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants (in shares)     37,962     130,345  
Fair Value Adjustment of Warrants     $ 600     $ 4,600  
Shares Tied to Derivative Liability [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   1,000,000     1,000,000    
Share-based Payment Arrangement, Option [Member]              
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   100,000 100,000   100,000 100,000