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Note 12 - Warrants and Derivative Liabilities (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Nov. 13, 2019
Apr. 17, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2019
Dec. 19, 2014
Nov. 13, 2014
Class of Warrant or Right, Outstanding (in shares)           0      
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants, Net of Tax     $ 4,648          
Hercules Technology Growth Capital [Member]                  
Stock Issued During Period, Shares, Warrant Exercised (in shares)   22,821              
Northeast Power Systems, Inc (NEPSI) [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               58,823  
Hercules Warrants [Member]                  
Gain (Loss) on Decrease Fair Value Upon Exercise of Warrant         $ 100        
Hercules Warrants [Member] | Secured Debt [Member] | Hercules Technology Growth Capital [Member]                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 7.85  
Derivative, Fair Value, Net, Total             $ 400    
November 2014 Warrant [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 818,181
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 7.81               $ 7.81
Common Unit, Issued (in shares)                 909,090
Common Shares Per Unit (in shares)                 1
Class of Warrant or Right, Number of Warrants to Purchase One Share of Stock (in shares)                 0.9
Class of Warrant or Right, Warrants Exercised (in shares) 786,000                
Class of Warrant or Right, Warrants Expired (in shares) 32,181                
Gain (Loss) in Change of Fair Value of Derivative Instruments and Warrants, Net of Tax         $ 4,600