Note 3 - Loans By Internally Assigned Risk Rating (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	$ 678,225,838	$ 616,200,797
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	6,381,586	18,031,845
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	21,653,762	13,927,250
Commercial Portfolio Segment [Member]
Loans	706,261,186	648,159,892
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	247,914,237	238,119,608
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]
Loans	44,672,408	46,929,876
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	458,961,143	406,027,442
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	2,114,505	8,630,658
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction Loans [Member]
Loans	1,780,000	1,780,000
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	5,954,788	8,846,286
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	8,659,703	5,772,898
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]
Loans	2,496,417	373,968
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	11,825,908	7,888,029
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	258,688,445	252,523,164
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	48,948,825	49,083,844
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	476,741,839	422,761,757
Commercial Real Estate Portfolio Segment [Member]
Loans	784,379,109	724,368,765
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member]
Loans	$ 1,429,773,626	$ 1,307,277,723
As a % of Total	95.92%	95.24%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Loans	$ 16,230,879	$ 37,288,789
As a % of Total	1.09%	2.72%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Loans	$ 44,635,790	$ 27,962,145
As a % of Total	2.99%	2.04%
Commercial and Commercial Real Estate Portfolio Segments [Member]
Loans	$ 1,490,640,295	$ 1,372,528,657
As a % of Total	100.00%	100.00%
Loans	$ 1,914,707,953	$ 1,790,286,285