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Note 19 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total 23.30% 23.30%
Deferred Federal, State and Local, Tax Expense (Benefit), Total $ 240,000 $ 212,000
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Total 240,000 212,000
Deferred Tax Assets, Foreign Deferred Revenue and Other Provision 4,054,000 4,434,000
Unrecognized Tax Benefits, Ending Balance 200,000 200,000
Unrecognized Tax Benefits, Period Increase (Decrease), Total 0 0
Mexican Subsidiaries [Member]    
Deferred Tax Assets, Foreign Deferred Revenue and Other Provision 4,054,000 4,434,000
State and Local Jurisdiction [Member]    
Income Taxes Paid 37,000 33,000
Proceeds from Income Tax Refunds 51,000 12,000
Operating Loss Carryforwards, Total 2,537,000 2,431,000
Operating Loss Carryforwards, Not Subject to Expiration 106,000  
Foreign Tax Authority [Member]    
Income Taxes Paid 293,000 109,000
Proceeds from Income Tax Refunds 0 0
Domestic Tax Authority [Member]    
Income Taxes Paid 0 0
Proceeds from Income Tax Refunds 92,000 $ 0
Operating Loss Carryforwards, Total 136,127,000  
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration $ 1,769,000