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