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Note 2 - Summary of Significant Accounting Policies (Details Textual)
shares in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 11, 2022
Jan. 31, 2022
USD ($)
Mar. 31, 2022
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax, Total       $ 0 $ 0
Warranty Period (Year)       1 year  
Foreign Currency Transaction Gain (Loss), before Tax, Total   $ 12,000     16,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total       $ 0 $ 0
Weighted Average Number of Shares, Common Stock Subject to Repurchase or Cancellation | shares       0 0
Number of Reportable Segments       1  
Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)       3 years  
Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year)       5 years  
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Number of Major Customers       0 1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]          
Concentration Risk, Percentage         21.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member]          
Number of Major Customers       1 1
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES          
Concentration Risk, Percentage       92.00% 94.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]          
Concentration Risk, Percentage     14.00%   10.00%
Reverse Stock Split [Member]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 20