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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Expense (Benefit), Total $ 449 $ 1,819 $ 1,550 $ 3,076
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 600 4,400 4,500 8,500
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount 3,700   3,700  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0 0 0 0
Accounting Standards Update 2016-09 [Member]        
Income Tax Expense (Benefit), Total $ 100 $ 300 $ 200 $ 700