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Note 13 - Income Taxes (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  | 21.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | $ 100,000 | $ (82,900,000)
Deferred Tax Assets, Valuation Allowance, Total |  | $ 121,000 | 50,000 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 3,000,000.0 | 2,400,000 |
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  | 5,220 | (27,450) | 21,050
Unrecognized Tax Benefits, Income Tax Penalties Accrued |  | 0 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  | 144,000 | $ 139,000 | $ 166,000
Undistributed Earnings of Foreign Subsidiaries |  | 1,300,000 |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 0 |  |
Effective Income Tax Rate Reconciliation, Dividend Received Deduction, Percent |  | 100.00% |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards, Total |  | $ 48,300,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total |  | $ 2,300,000 |  |
Open Tax Year |  | 2015 2016 2017 2018 2019 |  |
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  | $ 121,000 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 71,000 |  |
Domestic Tax Authority [Member] |  |  |  |
Open Tax Year |  | 2016 2017 2018 2019 |  |

X
- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the deduction of dividends received. + References No definition available. + Details
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