Note 4 - Loans Leases Receivable - Loans by Internally Assigned Risk Rating (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Loans	$ 2,397,414,282	$ 1,790,286,285
Commercial Portfolio Segment [Member]
Loans	827,637,263	648,159,892
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	796,568,451	616,200,797
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	6,305,772	18,031,845
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	24,763,040	13,927,250
Commercial Real Estate Portfolio Segment [Member]
Loans	1,093,458,860	724,368,765
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	332,387,621	252,523,164
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans	165,149,491	49,083,844
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	595,921,748	422,761,757
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	314,447,662	238,119,608
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]
Loans	158,108,465	46,929,876
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	582,854,048	406,027,442
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	7,559,380	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	4,437,122	8,846,286
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	10,380,369	5,772,898
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]
Loans	5,261,026	373,968
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loans	8,630,578	7,888,029
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Loans	210
Commercial and Commercial Real Estate Portfolio Segments [Member]
Loans	$ 1,921,096,123	$ 1,372,528,657
As a % of Total	100.00%	100.00%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Pass [Member]
Loans	$ 1,851,978,626	$ 1,307,277,723
As a % of Total	96.40%	95.24%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Special Mention [Member]
Loans	$ 20,082,274	$ 37,288,789
As a % of Total	1.05%	2.72%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Substandard [Member]
Loans	$ 49,035,013	$ 27,962,145
As a % of Total	2.55%	2.04%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Doubtful [Member]
Loans	$ 210
As a % of Total	0.00%