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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 |

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