Note 3 - Loans and Allowance for Loan Losses - Components of Loan Portfolio (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Loans		$ 3,453,459,000	$ 3,193,470,000
Percent of portfolio		100.00%	100.00%
Period increase (decrease)		8.10%
Commercial Portfolio Segment [Member]
Loans		$ 2,950,424,000	$ 2,793,962,000
Percent of portfolio		85.40%	87.50%
Period increase (decrease)		5.60%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans	[1]	$ 1,137,419,000	$ 1,145,423,000
Percent of portfolio	[1]	32.90%	35.90%
Period increase (decrease)	[1]	(0.70%)
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans		$ 43,239,000	$ 55,055,000
Percent of portfolio		1.30%	1.70%
Period increase (decrease)		(21.50%)
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans		$ 565,758,000	$ 529,953,000
Percent of portfolio		16.40%	16.60%
Period increase (decrease)		6.80%
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans		$ 1,027,415,000	$ 917,436,000
Percent of portfolio		29.70%	28.70%
Period increase (decrease)		12.00%
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans		$ 176,593,000	$ 146,095,000
Percent of portfolio		5.10%	4.60%
Period increase (decrease)		20.90%
Retail Portfolio Segment [Member]
Loans		$ 503,035,000	$ 399,508,000
Percent of portfolio		14.60%	12.50%
Period increase (decrease)		25.90%
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans		$ 60,488,000	$ 61,620,000
Percent of portfolio		1.80%	1.90%
Period increase (decrease)		(1.80%)
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans		$ 442,547,000	$ 337,888,000
Percent of portfolio		12.80%	10.60%
Period increase (decrease)		31.00%

[1] For December 31, 2021, and December 31, 2020, includes $40.1 million and $365 million in loans originated under the Paycheck Protection Program, respectively.