Note 3 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($)		Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Net of Deferred Income, Total		$ 3,453,459,000	$ 3,193,470,000
Loans past due 90 days or more still accruing interest		155,000	0
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		2,950,424,000	2,793,962,000
Loans past due 90 days or more still accruing interest		155,000	0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	[1]	1,137,419,000	1,145,423,000
Loans past due 90 days or more still accruing interest		155,000	0
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		43,239,000	55,055,000
Loans past due 90 days or more still accruing interest		0	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		565,758,000	529,953,000
Loans past due 90 days or more still accruing interest		0	0
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,027,415,000	917,436,000
Loans past due 90 days or more still accruing interest		0	0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		176,593,000	146,095,000
Loans past due 90 days or more still accruing interest		0	0
Retail Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		503,035,000	399,508,000
Loans past due 90 days or more still accruing interest		0	0
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		60,488,000	61,620,000
Loans past due 90 days or more still accruing interest		0	0
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		442,547,000	337,888,000
Loans past due 90 days or more still accruing interest		0	0
Financial Asset, 30 to 59 Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,424,000	1,520,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		27,000	261,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		14,000	261,000
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		13,000	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,397,000	1,259,000
Financial Asset, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		132,000	112,000
Financial Asset, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,265,000	1,147,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		243,000	681,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	369,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	172,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	197,000
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		243,000	312,000
Financial Asset, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		2,000	65,000
Financial Asset, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		241,000	247,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		295,000	840,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		193,000	444,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		193,000	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	421,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	23,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		102,000	396,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		20,000	54,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		82,000	342,000
Financial Asset, Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,962,000	3,041,000
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		220,000	1,074,000
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		207,000	433,000
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		13,000	0
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	618,000
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	23,000
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		0	0
Financial Asset, Past Due [Member] | Retail Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,742,000	1,967,000
Financial Asset, Past Due [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		154,000	231,000
Financial Asset, Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,588,000	1,736,000
Financial Asset, Not Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		3,451,497,000	3,190,429,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		2,950,204,000	2,792,888,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,137,212,000	1,144,990,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		43,226,000	55,055,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		565,758,000	529,335,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		1,027,415,000	917,413,000
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		176,593,000	146,095,000
Financial Asset, Not Past Due [Member] | Retail Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		501,293,000	397,541,000
Financial Asset, Not Past Due [Member] | Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		60,334,000	61,389,000
Financial Asset, Not Past Due [Member] | Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans and Leases Receivable, Net of Deferred Income, Total		$ 440,959,000	$ 336,152,000

[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.