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Note 1 - Summary of Significant Accounting Policies - Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
[1]
Total $ 1,130 $ 1,173
Finite-lived Intangible Assets, Excluding Projects in Process [Member]    
Remainder of 2021 93  
2022 186  
2023 185  
2024 113  
2025 41  
Thereafter 386  
Total $ 1,004  
[1] The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date