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Note 20 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%  
Effective Income Tax Rate Reconciliation, Percent, Total 23.30%  
Deferred Federal, State and Local, Tax Expense (Benefit), Total $ (212,000) $ (667,000)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Total 212,000 667,000
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   19,395,000
Deferred Tax Assets, Foreign Deferred Revenue and Other Provision 4,434,000 4,942,000
Unrecognized Tax Benefits, Ending Balance 200,000 200,000
Mexican Subsidiaries [Member]    
Deferred Tax Assets, Foreign Deferred Revenue and Other Provision 4,434,000 4,942,000
State and Local Jurisdiction [Member]    
Income Taxes Paid 33,000 110,000
Proceeds from Income Tax Refunds 12,000 63,000
Operating Loss Carryforwards, Total 5,869,000  
Foreign Tax Authority [Member]    
Income Taxes Paid 109,000 486,000
Proceeds from Income Tax Refunds 0 0
Domestic Tax Authority [Member]    
Income Taxes Paid 0 0
Proceeds from Income Tax Refunds 0 $ 0
Operating Loss Carryforwards, Total 137,764,000  
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration $ 3,186,000