Note 4 - Loans (Details Textual)	12 Months Ended
	Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Paycheck Protection Program Loans Originated Through the CARES Act	$ 12,200,000		$ 211,300,000
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	333,000		3,021,000
Overdraft Deposits	$ 90,000		$ 59,000
Financing Receivable, Modifications, Number of Contracts	1		5	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0		0	0
Loans and Leases Receivable, Net of Deferred Income, Total	$ 1,946,580,000		$ 2,015,056,000
Financing Receivable, Percent of Portfolio	17.10%
Mortgage Loans in Process of Foreclosure, Amount	$ 102,500		387,000
Real Estate Acquired Through Foreclosure	$ 0		285,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default			$ 1,052,000
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications, Number of Contracts	0		1	0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total			$ 88,000
Loans and Leases Receivable, Net of Deferred Income, Total	$ 299,773,000	[1]	491,256,000
Commercial Portfolio Segment [Member] | Hotel Loans [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	81,241,000		46,049,000	$ 204,655,000
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total				$ 24,000
Loans and Leases Receivable, Net of Deferred Income, Total	382,960,000		374,018,000
SBA CARES Act Paycheck Protection Program [Member]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total	$ 282,000		$ 4,439,000

[1] Includes PPP loans, which are guaranteed by the SBA and have no related allowance.