Note 3 - Loans Leases Receivable - Loans Leases Nonperforming Loans Leases (Details) - USD ($)		Mar. 31, 2018		Dec. 31, 2017
Accruing Past Due 90 Days or More		$ 40,940		$ 88,671
Nonaccrual Loans/Leases		12,758,985		11,441,234
Accruing TDRs		7,912,975		9,394,967
Loans		$ 3,046,799,276		$ 2,956,713,493
Percentage of Total NPLs		100.00%		100.00%
Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		$ 40,940		$ 88,671
Nonaccrual Loans/Leases		12,758,985	[1]	11,441,234	[2]
Accruing TDRs		5,275,492		7,112,472
Loans		$ 18,075,417		$ 18,642,377
Percentage of Total NPLs		100.00%		100.00%
Commercial Portfolio Segment [Member]
Accruing Past Due 90 Days or More		$ 36,162
Nonaccrual Loans/Leases		1,448,542		1,231,353	[2]
Loans	[3]	1,201,085,625		1,134,516,315
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		36,162
Nonaccrual Loans/Leases	[1]	1,448,542
Accruing TDRs		4,714,450		5,224,182
Loans		$ 6,199,154		$ 6,455,535
Percentage of Total NPLs		34.29%		34.63%
Commercial Real Estate Portfolio Segment [Member]
Loans		$ 1,357,703,386		$ 1,303,491,882
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate Loans [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases		329,313		333,900	[2]
Loans		346,996,627		332,742,477
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases		1,852,196		4,844,312	[2]
Loans		171,404,628		186,402,404
Commercial Real Estate Portfolio Segment [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases		4,868,082		1,243,728	[2]
Loans		839,302,131		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
Nonaccrual Loans/Leases	[1]	329,313
Accruing TDRs		107,322		107,322
Loans		$ 436,635		$ 441,222
Percentage of Total NPLs		2.42%		2.37%
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases	[1]	1,852,196
Accruing TDRs
Loans		$ 1,852,196		$ 4,844,312
Percentage of Total NPLs		10.25%		25.99%
Commercial Real Estate Portfolio Segment [Member] | Nonperforming Financial Instruments [Member] | Other Non-owner Occupied Commercial Real Estate Loans [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases	[1]	4,868,082
Accruing TDRs
Loans		$ 4,868,082		$ 1,243,728
Percentage of Total NPLs		26.93%		6.67%
Finance Leases Portfolio Segment [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases		2,806,398		2,175,044	[2]
Loans	[3],[4]	137,614,465		141,448,232
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases	[1]	2,806,398
Accruing TDRs		169,198		1,494,448
Loans	[4]	$ 2,975,596		$ 3,669,492
Percentage of Total NPLs		16.46%		19.68%
Residential Portfolio Segment [Member]
Accruing Past Due 90 Days or More				$ 74,519
Nonaccrual Loans/Leases		1,187,267		1,363,806	[2]
Loans	[5]	254,484,231	[4]	258,646,265
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More
Nonaccrual Loans/Leases	[1]	1,187,267
Accruing TDRs		271,694		272,493
Loans	[4]	$ 1,458,961		$ 1,710,818
Percentage of Total NPLs		8.07%		9.18%
Consumer Portfolio Segment [Member]
Accruing Past Due 90 Days or More		$ 4,778		$ 14,152
Nonaccrual Loans/Leases		267,187		249,091	[2]
Loans	[4]	95,911,569		118,610,799
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Accruing Past Due 90 Days or More		4,778
Nonaccrual Loans/Leases	[1]	267,187
Accruing TDRs		12,828		14,027
Loans	[4]	$ 284,793		$ 277,270
Percentage of Total NPLs		1.58%		1.49%

[1] Nonaccrual loans/leases included $2,637,483 of TDRs, including $25,984 in C&I loans, $1,312,469 in CRE loans, $1,208,050 in direct financing leases, $84,555 in residential real estate loans, and $6,425 in installment loans.

[2] 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 equipment financing agreements outstanding at m2, totaling $78,911,791 and $66,758,397 as of March 31, 2018 and December 31, 2017, respectively.

[4] Performing = loans/leases accruing and less than 90 days past due. Nonperforming = loans/leases on nonaccrual, accruing loans/leases that are greater than or equal to 90 days past due, and accruing TDRs.

[5] Includes residential real estate loans held for sale totaling $279,750 and $645,001 as of March 31, 2018, and December 31, 2017, respectively.