Note 9 - Leases - Lease Expense and Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finance lease amortization of right-of-use assets	$ 143	$ 185	$ 0
Interest on finance lease liabilities	19	25	0
Finance lease expense	162	210	0
Operating lease expense	2,468	2,383	2,087
Short-term lease expense	2	0	6
Variable lease expense	319	264	216
Total lease expense	$ 2,951	$ 2,857	$ 2,309
Operating leases (Year)	15 years 3 months 18 days	15 years 7 months 6 days
Financing leases (Year)	2 years 3 months 18 days	3 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	4.10%	4.10%
Finance Lease, Weighted Average Discount Rate, Percent	4.90%	5.00%
Right-of-use assets obtained in exchange for operating lease liabilities	$ 2,392	$ 2,340
Operating cash flows from financing leases	$ 136	$ 162