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Note 2 - Summary of Significant Accounting Policies (Details Textual)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of Wholly Owned Subsidiaries 5 5  
Asset Impairment Charges, Total $ 3,600,000 $ 3,599,322
Amortization of Intangible Assets, Total   124,550 120,488
Research and Development Expense, Total   372,648 597,456
Cash and Cash Equivalents, at Carrying Value, Ending Balance 7,699,335 7,699,335 8,664,253
Cash Equivalents, at Carrying Value, Total 1,000,000 1,000,000 2,100,000
Cash, Uninsured Amount 5,822,000 5,822,000 5,198,000
Accounts Receivable, Allowance for Credit Loss, Current 164,000 164,000 24,000
Retained Earnings (Accumulated Deficit), Ending Balance (2,902,898) (2,902,898) 3,172,054
Net Income (Loss) Attributable to Parent, Total   (6,074,952) (6,327,658)
Working Capital (Deficit) 8,100,000 8,100,000  
Accounts Receivable, after Allowance for Credit Loss, Current, Total 1,047,728 1,047,728 2,545,537
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total 494,281 494,281 512,952
Inventory, Net, Total 1,123,839 1,123,839 1,709,713
Income Taxes Receivable, Current $ 715,599 715,599
Cargo and Freight [Member]      
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 6,000 $ 39,000
Customer Concentration Risk [Member] | Export Sales [Member]      
Concentration Risk, Percentage   16.80% 21.30%
One Customer [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Concentration Risk, Percentage   35.00%  
Three Customers [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Concentration Risk, Percentage     61.00%
Two Customers [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Concentration Risk, Percentage   30.50%  
Two Customers [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Concentration Risk, Percentage     39.30%
Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year)   20 years  
Maximum [Member] | Building and Building Improvements [Member]      
Property, Plant and Equipment, Useful Life (Year)   39 years  
Maximum [Member] | Machinery and Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year)   8 years  
Minimum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year)   5 years  
Minimum [Member] | Machinery and Equipment [Member]      
Property, Plant and Equipment, Useful Life (Year)   5 years  
Computer Software, Intangible Asset [Member] | Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year)   5 years