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Note 15 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Restricted Cash and Cash Equivalents, Noncurrent, Total $ 5,604 $ 5,657
Preconfirmation, Restricted Cash and Cash Equivalents, Current 600 $ 600
Letter of Credit [Member]    
Escrow Deposit $ 5,000