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Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2021 | Dec. 31, 2017 | Dec. 31, 2020
Unrecognized Tax Benefits, Income Tax Penalties Accrued |  | $ 0 |  | $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 35.00% |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect | $ 200 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | $ 400 |  |
Domestic Tax Authority [Member] | Capital Loss Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | $ 800 |  |
Tax Credit Carryforward, Expiration Year |  | 2024 |  |
Domestic Tax Authority [Member] | Minimum [Member] |  |  |  |
Tax Credit Carryforward, Expiration Year |  | 2023 |  |
Domestic Tax Authority [Member] | Maximum [Member] |  |  |  |
Tax Credit Carryforward, Expiration Year |  | 2026 |  |
State and Local Jurisdiction [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | $ 4,400 |  |
Tax Credit Carryforward, Expiration Year |  | 2022 |  |
Operating Loss Carryforwards, Total |  | $ 27,300 |  |
State and Local Jurisdiction [Member] | Minimum [Member] |  |  |  |
Operating Loss Carryforwards, Expiration Year |  | 2022 |  |
State and Local Jurisdiction [Member] | Maximum [Member] |  |  |  |
Operating Loss Carryforwards, Expiration Year |  | 2038 |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards, Total |  | $ 4,600 |  |
Foreign Tax Authority [Member] | Minimum [Member] |  |  |  |
Operating Loss Carryforwards, Expiration Year |  | 2023 |  |
Foreign Tax Authority [Member] | Maximum [Member] |  |  |  |
Operating Loss Carryforwards, Expiration Year |  | 2030 |  |

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