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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income Tax Expense (Benefit), Total $ (119) $ 449 $ 964 $ 1,550  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total 1,700 600 4,900 4,500  
Effective Income Tax Rate Reconciliation, Foreign Exchange and Mark-to-market Adjustments, Amount (500) 500 (800)    
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount (400) (100) (200) (200)  
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