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Note 15 - Commitments and Contingencies (Details Textual) - USD ($)
Dec. 31, 2019
Jul. 01, 2019
Mar. 31, 2019
Restricted Cash and Cash Equivalents, Noncurrent, Total $ 5,754,000   $ 715,000
Letter of Credit [Member]      
Escrow Deposit   $ 5,000,000