Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating lease expense	$ 156	$ 351	$ 470	$ 1,023
Short-term lease expense	84	72	208	249
Land option expense	0	0	0	9
Total land option and lease expense	240	423	678	1,281
Cash flows from operating activities			509	600
In exchange for new operating lease liabilities during the period			712	605
Office Leases [Member]
Operating lease expense	156	238	470	691
Land Leases [Member]
Operating lease expense	$ 0	$ 113	$ 0	$ 332