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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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