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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%