Note 7 - Leases - Lease Expense (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Operating lease expense	[1]	$ 1,275	$ 1,175
Short-term lease expense		319	321
Land option expense		9	543
Total land option and lease expense		1,603	2,039
Cash flows from operating activities		1,004	1,844
Adoption of Topic 842		0	1,562
In exchange for new operating lease liabilities during the period		605	443
Office Leases [Member]
Operating lease expense		829	719
Land Leases [Member]
Operating lease expense		$ 446	$ 456

[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.