Note 4 - Loans Leases Receivable - Loans Leases Nonperforming Loans Leases (Details) - USD ($)		Dec. 31, 2018		Dec. 31, 2017
Accruing Past Due 90 Days or More		$ 631,744		$ 88,671
Nonaccrual Loans/Leases		14,259,739		11,441,234
Accruing TDRs		6,465,744		9,394,967
Loans and Leases Receivable, Net of Deferred Income		$ 3,723,630,222		$ 2,956,713,493
Percentage of Total NPLs		100.00%		100.00%
Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		$ 631,744		$ 88,671
Nonaccrual Loans/Leases		14,259,739	[1]	11,441,234	[2]
Accruing TDRs		3,658,938		7,112,472
Loans and Leases Receivable, Net of Deferred Income		$ 18,550,421		$ 18,642,377
Percentage of Total NPLs		100.00%		100.00%
Commercial Portfolio Segment [Member]
Accruing Past Due 90 Days or More		$ 389,138
Nonaccrual Loans/Leases		4,087,869		$ 1,231,353
Loans and Leases Receivable, Net of Deferred Income		1,429,409,587		1,134,516,315
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		389,138
Nonaccrual Loans/Leases		4,087,869	[1]	1,231,353	[2]
Accruing TDRs		454,229		5,224,182
Loans and Leases Receivable, Net of Deferred Income		$ 4,931,236		$ 6,455,535
Percentage of Total NPLs		26.58%		34.63%
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income		$ 1,766,110,775		$ 1,303,491,882
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Accruing Past Due 90 Days or More		106,470
Nonaccrual Loans/Leases		215,615		333,900
Loans and Leases Receivable, Net of Deferred Income		500,653,731		332,742,477
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Nonaccrual Loans/Leases		319,223		4,844,312
Loans and Leases Receivable, Net of Deferred Income		236,787,308		186,402,404
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Nonaccrual Loans/Leases		5,522,214		1,243,728
Loans and Leases Receivable, Net of Deferred Income		1,028,669,736		784,347,000
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Accruing Past Due 90 Days or More		106,470
Nonaccrual Loans/Leases		215,615	[1]	333,900	[2]
Accruing TDRs				107,322
Loans and Leases Receivable, Net of Deferred Income		$ 322,085		$ 441,222
Percentage of Total NPLs		1.74%		2.37%
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Nonaccrual Loans/Leases		$ 319,223	[1]	$ 4,844,312	[2]
Loans and Leases Receivable, Net of Deferred Income		$ 319,223		$ 4,844,312
Percentage of Total NPLs		1.72%		25.99%
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Nonaccrual Loans/Leases		$ 5,522,214	[1]	$ 1,243,728	[2]
Accruing TDRs		2,984,057
Loans and Leases Receivable, Net of Deferred Income		$ 8,506,271		$ 1,243,728
Percentage of Total NPLs		45.86%		6.67%
Finance Leases Portfolio Segment [Member]
Nonaccrual Loans/Leases		$ 1,761,022		$ 2,175,044
Loans and Leases Receivable, Net of Deferred Income		117,968,682		141,448,232
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Nonaccrual Loans/Leases		1,761,022	[1]	2,175,044	[2]
Accruing TDRs		111,423		1,494,448
Loans and Leases Receivable, Net of Deferred Income		$ 1,872,445		$ 3,669,492
Percentage of Total NPLs		10.09%		19.68%
Residential Portfolio Segment [Member]
Accruing Past Due 90 Days or More		$ 89,342		$ 74,519
Nonaccrual Loans/Leases		1,742,490		1,363,806
Loans and Leases Receivable, Net of Deferred Income	[3]	290,759,398		258,646,265
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		89,342		74,519
Nonaccrual Loans/Leases		1,742,490	[1]	1,363,806	[2]
Accruing TDRs		100,040		272,493
Loans and Leases Receivable, Net of Deferred Income		$ 1,931,872		$ 1,710,818
Percentage of Total NPLs		10.41%		9.18%
Consumer Portfolio Segment [Member]
Accruing Past Due 90 Days or More		$ 46,794		$ 14,152
Nonaccrual Loans/Leases		611,306		249,091
Loans and Leases Receivable, Net of Deferred Income		119,381,780		118,610,799
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		46,794		14,152
Nonaccrual Loans/Leases		611,306	[1]	249,091	[2]
Accruing TDRs		9,189		14,027
Loans and Leases Receivable, Net of Deferred Income		$ 667,289		$ 277,270
Percentage of Total NPLs		3.60%		1.49%

[1] At December 31, 2018, nonaccrual loans/leases included $2,311,198 of TDRs, including $265,181 in C&I loans, $1,378,090 in CRE loans, $321,050 in direct financing leases, $343,535 in residential real estate loans, and $3,342 in installment loans.

[2] At December 31, 2017, nonaccrual loans/leases included $2,282,495 of TDRs, including $122,598 in C&I loans, $1,336,871 in CRE loans, $700,255 in direct financing leases, $115,190 in residential real estate loans, and $7,581 in installment loans.

[3] Includes residential real estate loans held for sale totaling $1.3 million and $645 thousand as of December 31, 2018 and 2017, respectively.