Note 1 - Summary of Significant Accounting Policies - Net Sales by Geographical Region (Details) - USD ($)	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Revenue, Percentage	100.00%	100.00%
Revenue	$ 4,235,344	$ 4,011,519
Reportable Geographical Components [Member] \| Americas [Member]
Revenue, Percentage	28.00%	9.00%
Revenue	$ 1,197,197	$ 333,530
Reportable Geographical Components [Member] \| Asia Pacific [Member]
Revenue, Percentage	8.00%	11.00%
Revenue	$ 342,961	$ 451,895
Reportable Geographical Components [Member] \| Europe [Member]
Revenue, Percentage	63.00%	77.00%
Revenue	$ 2,650,915	$ 3,099,785
Reportable Geographical Components [Member] \| Middle East and Africa [Member]
Revenue, Percentage	1.00%	3.00%
Revenue	$ 44,271	$ 126,309

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details