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Note 5 - Income Taxes (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations, Global Intangible Low-taxed Income |  | $ 400,000 | $ 350,000
Deferred Tax Assets, Operating Loss Carryforwards, Total |  | 4,144,000 | 3,541,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  | 564,000 | 563,000
Deferred Tax Assets, Net of Valuation Allowance, Total |  | 6,097,000 | 6,023,000
Operating Loss Carryforwards, Total |  | 8,300,000 |
Operating Loss Carryforwards, Not Subject to Expiration |  | 4,000,000.0 |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | (2,100,000)
Deferred Tax Assets, Net, Total |  | $ 4,468,000 | 4,201,000
Open Tax Year |  | 2018 2019 2020 2021 |
Accrued Expenses and Other Current Liabilities [Member] |  |  |
Accrual for Taxes Other than Income Taxes |  | $ 686,000 | 1,300,000
Revision of Prior Period, Adjustment [Member] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Total | $ 2,400,000 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 600,000 |  |
Deferred Tax Assets, Net of Valuation Allowance, Total | (2,300,000) |  | (2,300,000)
Deferred Tax Liabilities, Net, Total | (2,300,000) |  | 2,300,000
Foreign Tax Authority [Member] | Secretariat of the Federal Revenue Bureau of Brazil [Member] |  |  |
Operating Loss Carryforwards, Not Subject to Expiration |  | 4,700,000 |
Foreign Tax Authority [Member] | Australian Taxation Office [Member] |  |  |
Operating Loss Carryforwards, Not Subject to Expiration |  | 1,400,000 |
Foreign Tax Authority [Member] | Previously Reported [Member] |  |  |
Income (Loss) Attributable to Parent, before Tax, Total | (615,000) |  |
Foreign Tax Authority [Member] | Revision of Prior Period, Adjustment [Member] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Total | (3,000,000.0) |  | $ (3,000,000.0)
Domestic Tax Authority [Member] |  |  |
Income (Loss) Attributable to Parent, before Tax, Total | $ (615,000) |  |
Deferred Tax Assets, Net, Total |  | $ 1,900,000 |

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