Note 6 - Other Borrowings and Unused Lines of Credit (Details) - Wholesale Repurchase Agreements - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Maturity:
Amount due	$ 115,000,000	$ 150,282,492
Wholesale Repurchase Agreements [Member]
Maturity:
Amount due	$ 115,000,000	$ 130,000,000
Weighted average interest rate at year end	3.13%	3.21%
Maturing in 2015 [Member] | Wholesale Repurchase Agreements [Member]
Maturity:
Amount due		$ 5,000,000
Weighted average interest rate at year end		2.77%
Maturing in 2017 [Member] | Wholesale Repurchase Agreements [Member]
Maturity:
Amount due	$ 10,000,000	$ 10,000,000
Weighted average interest rate at year end	3.00%	3.00%
Maturing in 2018 [Member] | Wholesale Repurchase Agreements [Member]
Maturity:
Amount due	$ 10,000,000	$ 10,000,000
Weighted average interest rate at year end	3.97%	3.97%
Maturing in 2019 [Member] | Wholesale Repurchase Agreements [Member]
Maturity:
Amount due	$ 50,000,000	$ 60,000,000
Weighted average interest rate at year end	3.41%	3.57%
Maturing Thereafter [Member] | Wholesale Repurchase Agreements [Member]
Maturity:
Amount due	$ 45,000,000	$ 45,000,000
Weighted average interest rate at year end	2.66%	2.66%