Note 4 - Loans/Leases Receivable (Details) - Loans By Credit Quality Indicators (USD $)	Dec. 31, 2014	Dec. 31, 2013
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	$ 491,883,568	$ 407,294,743
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	17,034,909	11,355,713
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	15,008,663	13,037,673
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	523,927,140	431,688,129
Owner-Occupied Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	245,237,462	250,028,731
Owner-Occupied Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	12,637,930	8,318,232
Owner-Occupied Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	2,193,688	2,868,949
Owner-Occupied Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	260,069,080	261,215,912
Commercial Construction, Land Development, and Other Land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	65,691,737	51,868,919
Commercial Construction, Land Development, and Other Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating		1,588,086
Commercial Construction, Land Development, and Other Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	2,427,252	4,387,897
Commercial Construction, Land Development, and Other Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	68,118,989	57,844,902
Non-Owner Occupied Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	354,581,419	326,168,882
Non-Owner Occupied Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	3,285,191	3,310,017
Non-Owner Occupied Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	16,085,743	23,213,216
Non-Owner Occupied Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	373,952,353	352,692,115
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	1,157,394,186	1,035,361,275
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	32,958,030	24,572,048
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	35,715,346	43,507,735
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Internally assigned risk rating	$ 1,226,067,562	$ 1,103,441,058