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v3.21.1

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Letters of Credit Outstanding, Amount | $ 500 | $ 500 |
Restricted Cash and Cash Equivalents, Current, Total | 3,212 | 3,212 | $ 309
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 343 | $ 343 | $ 335
Preferred Stock, Dividend Rate, Percentage |  | 12.00% |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ 1 | $ 1 |
Preferred Stock, Dividends Per Share, Declared (in dollars per share) |  | $ 0 | $ 0
Advertising Expense |  | $ 42 | $ 101
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) |  | 0 | 0
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease), Total | $ (220) |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance | $ 37 | $ 37 | $ 257
Foreign Currency Transaction Gain (Loss), before Tax, Total |  | $ 32 | $ 11
Revenue Benchmark [Member] | Product Concentration Risk [Member] |  |  |
Concentration Risk, Percentage |  | 2.10% | 3.10%

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