Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies Disclosure [Line Items]
Lessee leasing arrangements, operating leases, renewal term	5 years
Operating lease cost	$ 749	$ 808	$ 778
Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Standby letters of credit expiration period	1 year
Lessee leasing arrangements, operating leases, renewal term	10 years
Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Lessee leasing arrangements, operating leases, renewal term	5 years
Standby Letters of Credit [Member]
Commitments And Contingencies Disclosure [Line Items]
Financial instrument commitments expire within one year	$ 19,075