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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2019
Apr. 01, 2019
Operating Lease, Liability, Total $ 2,356  
Accounting Standards Update 2016-02 [Member]    
Operating Lease, Right-of-Use Asset   $ 1,461
Operating Lease, Liability, Total   $ 1,411