Note 8 - Leases - Operating Leases Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Operating lease right-of-use assets	$ 1,588	$ 1,728
Current portion of obligations under operating leases	552	529
Long-term portion of obligations under operating leases	1,036	1,199
Total obligations under operating leases	1,588	1,728
Leased property under finance leases	12,391	12,112
Less accumulated amortization	(6,657)	(6,377)
Leased property under finance leases, net	5,734	5,735
Current portion of obligations under finance leases	271	333
Long-term portion of obligations under finance leases	502	560
Total obligations under finance leases	$ 773	$ 893