Note 6 - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	$ 49,581,154	$ 41,742,321
Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]
Interest-bearing deposits at financial institutions	47,607,304	36,313,965
Interest-bearing deposits at financial institutions	47,607,304	36,313,965
Fair Value, Inputs, Level 2 [Member] | Interest Rate Cap [Member]
Interest rate caps	270,806	856,024
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Interest rate caps	9,867,856	3,044,525
Fair Value, Inputs, Level 2 [Member] | Non-maturity Deposits [Member]
Deposits	1,554,404,101	1,516,599,081
Deposits	1,554,404,101	1,516,599,081
Fair Value, Inputs, Level 2 [Member] | Time Deposits [Member]
Deposits	419,189,683	364,067,103
Deposits	420,107,000	364,192,000
Fair Value, Inputs, Level 2 [Member]
Federal funds sold	20,825,000	19,850,000
Federal funds sold	20,825,000	19,850,000
HTM	280,345,532	253,674,159
	285,809,115	255,691,285
AFS	240,481,640	323,434,982
Loans/leases receivable, net	1,889,426,132	1,767,672,541
Loans/leases receivable, net	1,897,957,225	1,764,178,772
Short-term borrowings	51,561,748	144,662,716
Short-term borrowings	51,561,748	144,662,716
FHLB advances	196,900,000	151,000,000
FHLB advances	198,373,000	153,143,000
Other borrowings	100,000,000	110,000,000
Other borrowings	106,692,000	116,061,000
Junior subordinated debentures	33,412,643	38,499,052
Junior subordinated debentures	24,627,848	27,642,093
Fair Value, Inputs, Level 3 [Member]
Loans/leases receivable, net	5,249,775	4,209,228
Loans/leases receivable, net	5,669,757	4,545,966
Cash and due from banks	49,581,154	41,742,321
Federal funds sold	20,825,000	19,850,000
Interest-bearing deposits at financial institutions	47,607,304	36,313,965
HTM	280,345,532
	285,809,115	255,691,285
AFS	230,613,784	323,434,982
Deposits	1,973,593,784	1,880,666,184
Other borrowings	$ 100,000,000	$ 110,000,000