Note 10 - Commitments and Contingencies (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Commitments And Contingencies Disclosure [Line Items]
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 43,000	$ 698,000
Standby Letters of Credit [Member]
Commitments And Contingencies Disclosure [Line Items]
Financial instrument commitments expire within one year	$ 16,088,000
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