Note 5 - Leases - Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Operating lease expense	[1]	$ 157	$ 150
Short-term lease expense		62	54
Total lease expense		219	204
Cash flows from operating activities		173	170
Office Leases [Member]
Operating lease expense		157	150
Land Leases [Member]
Operating lease expense		$ 0	$ 0

[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.