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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Cash and Cash Equivalents, at Carrying Value, Total | $ 14,365,000 | $ 16,651,000
Capitalized Contract Cost, Impairment Loss | $ 0 | 0
Standard Product Warranty, Period From Final Acceptance | 1 year |
Standard Product Warranty, Period From Date of Shipment | 15 months |
Cash Equivalents, at Carrying Value, Total | $ 11,700,000 | 7,000,000.0
Cash, Uninsured Amount | 1,500,000 | 8,600,000
Accounts Receivable, Allowance for Credit Loss, Current | 36,000 | 59,000
Cargo and Freight [Member] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 87,000 | $ 30,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member] |  |
Concentration Risk, Percentage | 66.00% | 50.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |
Concentration Risk, Percentage | 29.20% |
Customer Concentration Risk [Member] | Export Sales [Member] | Geographic Distribution, Foreign [Member] |  |
Concentration Risk, Percentage | 17.00% | 26.00%
DENMARK |  |
Cash, Uninsured Amount | $ 500,000 | $ 400,000
Minimum [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |
Maximum [Member] |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |
Building and Building Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Building and Building Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 39 years |
Machinery and Equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Machinery and Equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment, Useful Life | 8 years |

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