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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 |

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