Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Operating lease assets	$ 6,955	$ 7,850	[1]
Total leased assets	7,772	9,213
Property and Equipment [Member]
Finance lease assets	$ 817	$ 1,363

[1] The balance sheet at December 31, 2022 has been derived from the audited financial statements at that date