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Note 2 - Significant Accounting Policies - Summary of Cash Equivalents and Short-term Investment (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents $ 76,201 $ 63,131
Unrealized gains 0 0
Unrealized losses 0 (2)
Totals, amortized cost 46,546 69,849
Totals, fair value 46,546 69,847
Commercial Paper [Member]    
Investments, amortized cost 4,873 14,590
Unrealized gains 0 0
Unrealized losses 0 (1)
Investments, fair value 4,873 14,589
Corporate Bond Securities [Member]    
Investments, amortized cost   4,387
Unrealized gains   0
Unrealized losses   (1)
Investments, fair value   4,386
Cash Equivalents [Member]    
Cash and cash equivalents 41,673 50,872
Cash equivalents $ 41,673 $ 50,872