Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating lease assets	$ 504	$ 636
Finance lease assets	7,339	6,917
Total leased assets	7,843	7,553
Operating lease assets	296	356
Operating lease assets	1,235	1,033
Operating lease assets	168	209
Operating lease assets	6,977	6,763
Operating lease assets	8,676	8,361
Property and Equipment [Member]
Finance lease assets	$ 7,339	$ 6,917