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Note 2 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Number of Wholly Owned Subsidiaries | 5 |  |
Capitalized Computer Software, Amortization | $ 142,480 | $ 144,500 |
Amortization of Intangible Assets, Total | 120,488 | 115,800 |
Research and Development Expense, Total | 597,456 | 606,618 |
Cash and Cash Equivalents, at Carrying Value, Ending Balance | 8,664,253 | 11,439,361 | $ 14,210,909
Cash Equivalents, at Carrying Value, Total | 2,100,000 | 7,500,000 |
Cash, Uninsured Amount | 5,198,000 | 6,920,000 |
Accounts Receivable, Allowance for Credit Loss, Current | 24,000 | 24,000 |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset | 84,000 |  |
Cargo and Freight [Member] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 39,000 | $ 61,200 |
Customer Concentration Risk [Member] | Export Sales [Member] |  |  |
Concentration Risk, Percentage | 21.30% | 9.90% |
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 |  | 42.00% |
Two Customers [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Concentration Risk, Percentage | 39.30% |  |
One Customer [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Concentration Risk, Percentage | 38.20% |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Minimum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment, Useful Life | 39 years |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |
Property, Plant and Equipment, Useful Life | 8 years |  |
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |

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