Note 3 - Loans Leases Receivable - Loans By Internally Assigned Risk Rating (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	$ 770,822,390	$ 616,200,797
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	10,160,760	18,031,845
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	23,324,412	13,927,250
Commercial Portfolio Segment [Member]
Loans	804,307,562	648,159,892
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	307,017,431	238,119,608
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]
Loans	153,401,738	46,929,876
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	572,769,744	406,027,442
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	1,737,127	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	5,894,259	8,846,286
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	9,144,453	5,772,898
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]
Loans	5,345,356	373,968
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	13,214,653	7,888,029
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	317,899,011	252,523,164
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	160,527,094	49,083,844
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	591,878,656	422,761,757
Commercial Real Estate Portfolio Segment [Member]
Loans	1,070,304,761	724,368,765
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member]
Loans	$ 1,804,011,303	$ 1,307,277,723
As a % of Total	96.24%	95.24%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Loans	$ 19,572,146	$ 37,288,789
As a % of Total	1.04%	2.72%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Loans	$ 51,028,874	$ 27,962,145
As a % of Total	2.72%	2.04%
Commercial and Commercial Real Estate Portfolio Segments [Member]
Loans	$ 1,874,612,323	$ 1,372,528,657
As a % of Total	100.00%	100.00%
Loans	$ 2,352,534,732	$ 1,790,286,285