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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Income Tax Expense (Benefit), Total $ 1,083 $ 1,101  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 3,200 3,900  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0   $ 0
Accounting Standards Update 2016-09 [Member]      
Income Tax Expense (Benefit), Total $ 200 $ 200