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Note 5 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 1999
Income Tax Expense (Benefit), Continuing Operations, Global Intangible Low-taxed Income |  | $ 350,000 | $ 400,000 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total |  | 1,158,000 | 2,875,000 |  |
Deferred Tax Assets, Valuation Allowance, Total |  | 397,000 | 2,511,000 |  |
Operating Loss Carryforwards, Total |  | 5,440,000 |  |  |
Operating Loss Carryforwards, Not Subject to Expiration |  | 1,580,000 |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | (2,100,000) |  |  |
Operating Loss Carryforwards, Unused |  |  |  | $ 300,000 |
Operating Loss Carryforwards, Write-off |  |  |  | $ 84,000 |
Deferred Tax Assets, Net, Total |  | $ 4,201,000 | 1,883,000 |  |
Open Tax Year |  | 2014 2015 2016 2017 2018 2019 2020 |  |  |
Accrued Expenses and Other Current Liabilities [Member] |  |  |  |  |
Accrual for Taxes Other than Income Taxes |  | $ 1,300,000 |  |  |
Second Subsidiary Acquired March 2010 [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  |  |  |  | $ 300,000
Foreign Tax Authority [Member] | Brazilian Federal Revenue Department [Member] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  |  | 10,500,000 |  |
Foreign Tax Authority [Member] | Brazilian Federal Revenue Department [Member] | Forecast [Member] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (15,400,000) |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Deferred Tax Assets, Net, Total |  | $ 1,200,000 |  |  |
Revision of Prior Period, Error Correction, Adjustment [Member] |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total |  |  | 2,200,000 |  |
Deferred Tax Assets, Valuation Allowance, Total |  |  | $ 2,200,000 |  |

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