Note 7 - Leases - Operating Leases Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Operating lease right-of-use assets	$ 1,254	$ 1,270
Leased property under finance leases	13,136	13,131
Current portion of obligations under operating leases	417	432
Less accumulated amortization	(7,556)	(7,420)
Long-term portion of obligations under operating leases	837	838
Leased property under finace leases, net	5,580	5,711
Total obligations under operating leases	1,254	1,270
Current portion of obligations under finance leases	197	198
Long-term portion of obligations under finance leases	585	598
Total obligations under finance leases	$ 782	$ 796