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Note 2 - Securities - Schedule of Maturities of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Less than 1 Year	$ 20,695
1 Year - 5 Years	89,067
5 years to 10 years	268,898
More than 10 Years	17,345
Equity securities at fair value (Note 2)	2,667	$ 2,851
Investment	$ 396,005	342,430
U.S. Government and federal agency	0.00%
1 year to 5 years, weighted average yield	0.00%
5 years to 10 years , weighted average yields	4.61%
More than 10 years , weighted average yields	0.00%
Weighted average yields, total	1.27%
US Treasury and Government [Member]
Less than 1 Year	$ 0
1 Year - 5 Years	2,061
5 years to 10 years	0
More than 10 Years	0
Equity securities at fair value (Note 2)	$ 2,061	17,215
U.S. Government and federal agency	0.00%
1 year to 5 years, weighted average yield	1.98%
5 years to 10 years , weighted average yields	0.00%
More than 10 years , weighted average yields	0.00%
Weighted average yields, total	1.98%
US Treasury Securities [Member]
Less than 1 Year	$ 0
1 Year - 5 Years	2,065
5 years to 10 years	0
More than 10 Years	0
Equity securities at fair value (Note 2)	$ 2,065	2,008
U.S. Government and federal agency	0.00%
1 year to 5 years, weighted average yield	1.85%
5 years to 10 years , weighted average yields	0.00%
More than 10 years , weighted average yields	0.00%
Weighted average yields, total	1.85%
US States and Political Subdivisions Debt Securities [Member]
Less than 1 Year	$ 14,534
1 Year - 5 Years	53,241
5 years to 10 years	187,171
More than 10 Years	13,604
Equity securities at fair value (Note 2)	$ 268,550	173,924
U.S. Government and federal agency	1.78%
1 year to 5 years, weighted average yield	2.88%
5 years to 10 years , weighted average yields	2.72%
More than 10 years , weighted average yields	3.02%
Weighted average yields, total	2.72%
Trust Preferred Securities [Member]
Less than 1 Year	$ 0
1 Year - 5 Years	0
5 years to 10 years	1,000
More than 10 Years	0
Equity securities at fair value (Note 2)	$ 1,000	1,000
U.S. Government and federal agency	1.37%
1 year to 5 years, weighted average yield	2.86%
5 years to 10 years , weighted average yields	0.00%
More than 10 years , weighted average yields	0.00%
Weighted average yields, total	1.90%
Corporate Debt Securities [Member]
Less than 1 Year	$ 1,856
1 Year - 5 Years	1,033
5 years to 10 years	0
More than 10 Years	0
Equity securities at fair value (Note 2)	2,889	2,672
Collateralized Mortgage Backed Securities [Member]
Less than 1 Year	4,305
1 Year - 5 Years	30,667
5 years to 10 years	79,727
More than 10 Years	2,074
Equity securities at fair value (Note 2)	$ 116,773	142,760
U.S. Government and federal agency	0.00%
1 year to 5 years, weighted average yield	0.00%
5 years to 10 years , weighted average yields	4.66%
More than 10 years , weighted average yields	0.00%
Weighted average yields, total	4.66%
Equity Securities [Member]
Less than 1 Year	$ 0
1 Year - 5 Years	0
5 years to 10 years	1,000
More than 10 Years	1,667
Equity securities at fair value (Note 2)	$ 2,667	2,851
U.S. Government and federal agency	4.93%
1 year to 5 years, weighted average yield	2.24%
5 years to 10 years , weighted average yields	0.79%
More than 10 years , weighted average yields	3.06%
Weighted average yields, total	1.36%
Debt [Member]
Less than 1 Year	$ 16,390
1 Year - 5 Years	58,400
5 years to 10 years	188,171
More than 10 Years	13,604
Equity securities at fair value (Note 2)	$ 276,565	$ 196,819

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