Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating lease expense	$ 150	$ 312
Short-term lease expense	54	91
Land option expense	0	8
Total land option and lease expense	204	411
Cash flows from operating activities	170	259
Office Leases [Member]
Operating lease expense	150	205
Land Leases [Member]
Operating lease expense	$ 0	$ 107