Note 7 - Short-Term Borrowings (Details) - Overnight Repurchase Agreements (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Securities underlying the agreements as of end of period:
Carrying value	$ 143,262,002	$ 160,950,808
Fair value	143,262,002	160,950,808
Repurchase Agreements With Customers [Member]
Note 7 - Short-Term Borrowings (Details) - Overnight Repurchase Agreements [Line Items]
Average daily balance during the period	123,543,416	111,782,307
Average daily interest rate during the period	0.12%	0.13%
Maximum month-end balance during the period	146,075,177	141,890,506
Weighted average rate as of end of period	0.13%	0.11%
Federal Funds Purchased [Member]
Note 7 - Short-Term Borrowings (Details) - Overnight Repurchase Agreements [Line Items]
Average daily balance during the period	41,156,729	52,379,823
Average daily interest rate during the period	0.40%	0.27%
Maximum month-end balance during the period	$ 95,380,000	$ 80,150,000
Weighted average rate as of end of period	0.28%	0.26%