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Note 20 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent   38.90%  
Deferred Income Tax Expense (Benefit)   $ (667,000) $ 0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent   667,000  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   19,395,000  
Undistributed Earnings of Foreign Subsidiaries   0  
Deferred Tax Assets, Foreign Deferred Revenue and Other Provision   4,942,000 3,269,000
Unrecognized Tax Benefits   200,000 200,000
Unrecognized Tax Benefits, Period Increase (Decrease)   0 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   0 0
Mexican Subsidiaries [Member]      
Deferred Tax Assets, Foreign Deferred Revenue and Other Provision   4,942,000 3,269,000
State and Local Jurisdiction [Member]      
Income Taxes Paid   110,000 41,000
Proceeds from Income Tax Refunds   63,000 0
Operating Loss Carryforwards   95,294,000  
Foreign Tax Authority [Member]      
Income Taxes Paid   486,000 141,000
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   $ 134,962,000  
Scenario, Forecast [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%