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Note 5 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, GILTI, Amount | $ 0 | $ 323,000 |
Effective Income Tax Rate Reconciliation, Percent | 33.00% | 56.60% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% |
Deferred Tax Assets, Net | $ 4,687,000 | $ 3,766,000 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 50,000.00 |  |
Unrecognized Tax Benefits, Income Tax Penalties Expense | 1,000 | 800,000 |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 4,000 | 300,000 |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 15,000 | $ 14,000 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 17,000 |  | $ 16,000
Domestic Tax Authority [Member] |  |  |
Deferred Tax Assets, Net | 2,300,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | $ 0 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Operating Loss Carryforwards | $ 5,000,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 1,100,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 600,000 |  |
Capital Loss Carryforward | 300,000 |  |
Capital Loss Carryforward, Tax Effect | 100,000 |  |
State and Local Jurisdiction [Member] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 100,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 15,000 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 17,000 |  |
Foreign Tax Authority [Member] |  |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 0 |  |
Foreign Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member] |  |  |
Tax Credit Carryforward, Amount | 200,000 |  |
Foreign Tax Authority [Member] | Brazilian Federal Revenue Office [Member] |  |  |
Operating Loss Carryforwards, Not Subject to Expiration | 1,700,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 600,000 |  |
Foreign Tax Authority [Member] | State Administration of Taxation, China [Member] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 200,000 |  |
Operating Loss Carryforwards, Subject to Expiration | 1,000,000 |  |
Foreign Tax Authority [Member] | Mexican Tax Authority [Member] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 300,000 |  |
Operating Loss Carryforwards, Subject to Expiration | $ 1,100,000 |  |

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