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Note 1 - Summary of Significant Accounting Policies - Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
[1]
Dec. 31, 2019
Total $ 524 $ 1,173 $ 1,338
Finite-lived Intangible Assets, Excluding Projects in Process [Member]      
Remainder of 2021 36    
2022 145    
2023 145    
2024 72    
Total $ 398    
[1] The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date