Note 6 - Leases - Lease Expense (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Operating lease expense	[1]	$ 627	$ 1,275
Short-term lease expense		278	319
Land option expense		0	9
Total land option and lease expense		905	1,603
Cash flows from operating activities		624	1,004
In exchange for new operating lease liabilities during the period		712	605
Office Leases [Member]
Operating lease expense		627	829
Land Leases [Member]
Operating lease expense		$ 0	$ 446

[1] Includes amortization of right-of-use assets for the three months ended March 31, 2020 and 2019 of $294 thousand and $184 thousand, respectively.