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v3.22.1

Note 2 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Number of Wholly Owned Subsidiaries |  | 5 |
Asset Impairment Charges, Total | $ 3,600,000 | $ 0 | $ 3,599,322
Amortization of Intangible Assets, Total |  | 112,310 | 124,550
Research and Development Expense, Total |  | 481,186 | 372,648
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 7,699,335 | 16,651,371 | 7,699,335
Cash Equivalents, at Carrying Value, Total | 1,000,000.0 | 7,000,000.0 | 1,000,000.0
Cash, Uninsured Amount | 5,822,000 | 8,613,000 | 5,822,000
Accounts Receivable, Allowance for Credit Loss, Current | $ 164,000 | 59,000 | 164,000
Cargo and Freight [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  | $ 30,000 | $ 6,000
Customer Concentration Risk [Member] | Export Sales [Member] | Geographic Distribution, Foreign [Member] |  |  |
Concentration Risk, Percentage |  | 26.00% | 16.80%
Two Customers [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk, Percentage |  | 50.00% | 35.00%
Two Customers [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Concentration Risk, Percentage |  |  | 30.50%
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 5 years |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  | 20 years |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 5 years |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 39 years |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 5 years |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 8 years |

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