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Note 7 - Line of Credit (Details Textual) - HSBC Venture Bank USA Inc. [Member] - USD ($)
$ in Thousands
36 Months Ended
Apr. 07, 2020
Mar. 31, 2023
Revolving Credit Facility [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 30,000  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%  
Proceeds from Lines of Credit, Total   $ 0
Revolving Credit Facility [Member] | Secured Overnight Financing Rate (SOFR) [Member]    
Debt Instrument, Basis Spread on Variable Rate 0.10%  
Line of Credit, Accordion Feature [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000