Note 3 - Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Beginning Balance	$ 5,563,000	$ 10,067,000	$ 6,414,000	$ 8,587,000
Charge-Offs	(17,000)	0	(17,000)	0
Payments	(75,000)	(3,537,000)	(3,596,000)	(8,512,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	184,000	7,000	2,854,000	6,462,000
Ending Balance	5,655,000	6,537,000	5,655,000	6,537,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	0	80,000	0	85,000
Charge-Offs	0	0	0	0
Payments	0	(80,000)	0	(85,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	0	0	0	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	13,888,000	3,791,000	14,797,000	1,145,000
Charge-Offs	0	0	0	0
Payments	(439,000)	(827,000)	(2,034,000)	(1,836,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	55,000	686,000	3,710,000
Ending Balance	13,449,000	3,019,000	13,449,000	3,019,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	153,000	170,000	480,000	178,000
Charge-Offs	0	0	0	0
Payments	(2,000)	(4,000)	(329,000)	(12,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	569,000	0	569,000
Ending Balance	151,000	735,000	151,000	735,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Beginning Balance	0	1,000	0	7,000
Charge-Offs	0	0	0	0
Payments	0	(1,000)	0	(7,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	92,000	0	92,000	0
Ending Balance	92,000	0	92,000	0
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Beginning Balance	1,396,000	1,715,000	1,146,000	1,415,000
Charge-Offs	0	0	0	0
Payments	(91,000)	(220,000)	(323,000)	(423,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	82,000	482,000	585,000
Ending Balance	1,305,000	1,577,000	1,305,000	1,577,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Beginning Balance	699,000	715,000	806,000	724,000
Charge-Offs	0	0	0	0
Payments	(51,000)	(17,000)	(204,000)	(46,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	69,000	46,000	89,000
Ending Balance	$ 648,000	$ 767,000	$ 648,000	$ 767,000