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Note 2 - NEPSI Acquisitions - Purchase Price (Details) - USD ($)
$ in Thousands
7 Months Ended 9 Months Ended
Oct. 01, 2020
Oct. 26, 2019
Dec. 31, 2020
Cash payment   $ 26,000
Northeast Power Systems, Inc (NEPSI) [Member]      
Cash payment $ 26,000    
Issuance of 873,657 shares of Company’s common stock 12,400    
Contingent consideration 4,000    
Total consideration $ 42,400