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Note 1 - Summary of Significant Accounting Policies - Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
[1]
Total $ 1,297 $ 1,343
Finite-lived Intangible Assets, Excluding Projects in Process [Member]    
Remainder of 2020 139  
2021 185  
2022 185  
2023 185  
Thereafter 542  
Total $ 1,236  
[1] The balance sheet at December 31, 2019 has been derived from the audited financial statements at that date