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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Tax Expense (Benefit), Total $ 840 $ 3,133 $ 2,390 $ 6,209  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 1,600 7,300 6,100 15,800  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0   0   $ 0
Accounting Standards Update 2016-09 [Member]          
Income Tax Expense (Benefit), Total $ 300 $ 100 $ 100 $ 800