Note 6 - Leases - Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating lease expense	[1]	$ 312	$ 236
Short-term lease expense		91	32
Land option expense		8	160
Total land option and lease expense		411	428
Cash flows from operating activities		259	258
Adoption of Topic 842			1,562
Office Leases [Member]
Operating lease expense		205	116
Land Leases [Member]
Operating lease expense		$ 107	$ 120

[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.