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Note 4 - Loans Leases Receivable - Composition of the Loan Lease Portfolio (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gross loans/leases receivable $ 3,732,754,042 $ 2,964,485,400    
Less allowance (39,847,108) (34,355,728) $ (30,757,448) $ (26,140,906)
Net loans/leases receivable 3,692,906,934 2,930,129,672    
Plus deferred loan/lease origination costs, net of fees 9,123,820 7,771,907    
Loans and leases 3,723,630,222 2,956,713,493    
Commercial Portfolio Segment [Member]        
Less allowance (16,420,217) (14,323,036) (12,545,110) (10,484,080)
Loans and leases 1,429,409,587 1,134,516,315    
Commercial Real Estate Portfolio Segment [Member]        
Less allowance (17,719,251) (13,962,688) (11,670,609) (9,375,117)
Loans and leases 1,766,110,775 1,303,491,882    
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]        
Loans and leases 500,653,731 332,742,477    
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]        
Loans and leases 236,787,308 186,402,404    
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]        
Loans and leases 1,028,669,736 784,347,000    
Finance Leases Portfolio Segment [Member]        
Net minimum lease payments to be received 130,370,520 156,583,887    
Estimated unguaranteed residual values of leased assets 828,402 929,932    
Unearned lease/residual income (13,230,240) (16,065,587)    
Gross loans/leases receivable 121,611,389 146,072,259    
Less allowance (1,792,486) (2,382,098) (3,111,898) (3,395,088)
Net loans/leases receivable 119,818,903 143,690,161    
Plus deferred loan/lease origination costs, net of fees 3,642,707 4,624,027    
Loans and leases 117,968,682 141,448,232    
Residential Portfolio Segment [Member]        
Less allowance (2,556,636) (2,466,431) (2,342,344) (1,790,150)
Loans and leases [1] 290,759,398 258,646,265    
Consumer Portfolio Segment [Member]        
Less allowance (1,358,518) (1,221,475) $ (1,087,487) $ (1,096,471)
Loans and leases $ 119,381,780 $ 118,610,799    
[1] Includes residential real estate loans held for sale totaling $1.3 million and $645 thousand as of December 31, 2018 and 2017, respectively.