Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating lease expense	$ 164	$ 360	$ 314	$ 672
Short-term lease expense	70	86	124	177
Land option expense	0	1	0	9
Total land option and lease expense	234	447	438	858
Cash flows from operating activities			452	461
In exchange for new operating lease liabilities during the period			712	605
Office Leases [Member]
Operating lease expense	164	248	314	453
Land Leases [Member]
Operating lease expense	$ 0	$ 112	$ 0	$ 219