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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