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Note 19 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
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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 |

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