Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Letters of Credit Outstanding, Amount	$ 300
Restricted Cash and Cash Equivalents, Current, Total	1,454	$ 1,582
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 334	$ 328
Preferred Stock, Dividend Rate, Percentage	12.00%
Preferred Stock, Liquidation Preference Per Share	$ 1.00
Preferred Stock, Dividends Per Share, Declared (in dollars per share)	$ 0	$ 0
Advertising Expense	$ 63	$ 57
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	205,907	156,937
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease), Total	$ 426	$ (93)
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease), Total	(426)	93
Foreign Currency Transaction Gain (Loss), before Tax, Total	$ 42	$ 131
Revenue Benchmark [Member] | Product Concentration Risk [Member] | Geographic Distribution, Domestic [Member]
Concentration Risk, Percentage	4.00%	3.10%
Employee-related Liabilities, Current [Member]
Accrual for Taxes Other than Income Taxes	$ 1,158