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Note 7 - Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Cash and cash equivalents	$ 20,127	$ 55,408
Amortized cost basis	35,298
Unrealized gains	1
Unrealized losses	(155)
Fair value	35,144
Total assets at fair value	35,894
Total assets at fair value, unrealized gains	1
Total assets at fair value, unrealized losses	(155)
Total assets at fair value, fair value	35,740
US Treasury and Government [Member]
Amortized cost basis	18,991
Unrealized gains	0
Unrealized losses	(76)
Fair value	18,915
Corporate Debt Securities [Member]
Amortized cost basis	6,548
Unrealized gains	0
Unrealized losses	(63)
Fair value	6,485
Commercial Paper [Member]
Amortized cost basis	2,014
Unrealized gains	0
Unrealized losses	(3)
Fair value	2,011
Certificates of Deposit [Member]
Amortized cost basis	7,745
Unrealized gains	1
Unrealized losses	(13)
Fair value	7,733
Money Market Funds [Member]
Cash and cash equivalents	596
Money market funds, unrealized gains	0
Money market funds, unrealized loss	0
Money market funds, fair value	$ 596

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