Note 2 - Summary of Significant Accounting Policies (Details Textual) € in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 EUR (€)	May 31, 2018 USD ($)
Restricted Cash, Total	$ 0	$ 1,142
Accounts Receivable, Allowance for Credit Loss, Recovery	198	470
Accounts Receivable, Credit Loss Expense (Reversal)	$ 0	286
Number of Reporting Units	3
Inventory Write-down	$ 544	771
Depreciation, Total	1,021	809
Deferred Grant Proceeds	246
Foreign Currency Transaction Gain (Loss), before Tax, Total	9	(109)
City of Rochester and State of New York [Member]
Contingent Liability, Repayment of State and Local Grant Funds Received				$ 550
Covenant, Future Amount Receivable	$ 193
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	1 year
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years
Bank Guarantee on Customer Order Deposit [Member]
Restricted Cash, Total		$ 1,142	€ 1,160