Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities (USD $)	Mar. 31, 2014	Dec. 31, 2013
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Cash and due from banks	$ 55,444,302	$ 41,950,790
Federal funds sold	11,570,000	39,435,000
Interest-bearing deposits at financial institutions	44,389,277	33,044,917
Investment securities:
Held to maturity	161,629,152
Held to maturity	157,617,860	138,640,105
Available for sale	545,477,537	551,758,458
Loans/leases receivable, net	1,121,578,680	1,103,441,058
Deposits:
Deposits	1,671,893,643	1,646,991,243
Other borrowings	142,250,644	142,448,362
Nonmaturity Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits:
Deposits	1,296,408,620	1,256,209,352
Deposits, fair value	1,296,408,620	1,256,209,352
Time Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Deposits:
Deposits	375,485,023	390,781,891
Deposits, fair value	376,596,000	391,923,000
Fair Value, Inputs, Level 1 [Member]
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Cash and due from banks	55,444,302	41,950,790
Cash and due from banks	55,444,302	41,950,790
Interest-bearing deposits at financial institutions	55,444,302	41,950,790
Investment securities:
Available for sale	317,137	317,698
Fair Value, Inputs, Level 2 [Member]
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Federal funds sold	11,570,000	39,435,000
Federal funds sold	11,570,000	39,435,000
Investment securities:
Available for sale	545,160,400	551,440,760
Loans/leases receivable, net	1,462,959,422	1,430,489,328
Loans/leases receivable, net, fair value	1,472,150,150	1,441,952,443
Deposits:
Short-term borrowings	165,569,112	149,292,967
Short-term borrowings	165,569,112	149,292,967
Federal Home Loan Bank advances	235,700,000	231,350,000
Federal Home Loan Bank advances	245,555,000	241,623,000
Other borrowings	142,250,644	142,448,362
Other borrowings	152,184,000	152,761,000
Junior subordinated debentures	40,322,765	40,289,830
Junior subordinated debentures	28,218,054	28,094,228
Fair Value, Inputs, Level 3 [Member]
Investment securities:
Held to maturity	161,629,152	145,451,895
Held to maturity	157,617,860	138,640,105
Loans/leases receivable, net	6,966,850	8,342,182
Loans/leases receivable, net, fair value	7,524,198	9,009,557
Interest-bearing Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Note 6 - Fair Value (Details) - Carrying Values and Estimated Fair Values of Financial Assets and Liabilities [Line Items]
Cash and due from banks	44,389,277	33,044,917
Interest-bearing deposits at financial institutions	44,389,277	33,044,917
Interest-bearing deposits at financial institutions	$ 44,389,277	$ 33,044,917