Note 4 - Loans Leases Receivable - Leases By Delinquency Status (Details) - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Loans and leases		$ 3,723,630,222	$ 2,956,713,493
Delinquency Status [Member]
Loans and leases	[1]	103,403,103	66,758,397
Nonperforming Financial Instruments [Member]
Loans and leases		18,550,421	18,642,377
Commercial Portfolio Segment [Member]
Loans and leases		1,429,409,587	1,134,516,315
Commercial Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	[1]	102,712,527	65,847,177
Commercial Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	[1]	690,576	911,220
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases		4,931,236	6,455,535
Finance Leases Portfolio Segment [Member]
Loans and leases		117,968,682	141,448,232
Finance Leases Portfolio Segment [Member] | Delinquency Status [Member]
Loans and leases	[1]	117,968,682	141,448,232
Finance Leases Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	[1]	116,096,237	137,778,740
Finance Leases Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	[1]	1,872,445	3,669,492
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases		1,872,445	3,669,492
Residential Portfolio Segment [Member]
Loans and leases	[2]	290,759,398	258,646,265
Residential Portfolio Segment [Member] | Delinquency Status [Member]
Loans and leases	[1]	290,759,398	258,646,265
Residential Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	[1]	288,827,527	256,935,447
Residential Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	[1]	1,931,871	1,710,818
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases		1,931,872	1,710,818
Consumer Portfolio Segment [Member]
Loans and leases		119,381,780	118,610,799
Consumer Portfolio Segment [Member] | Delinquency Status [Member]
Loans and leases	[1]	119,381,780	118,610,799
Consumer Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	[1]	118,714,491	118,333,529
Consumer Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	[1]	667,289	277,270
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and leases		667,289	277,270
Lease Residential and Consumer Portfolio Segments [Member] | Delinquency Status [Member]
Loans and leases	[1]	$ 631,512,963	$ 585,463,693
As a % of Total	[1]	100.00%	100.00%
Lease Residential and Consumer Portfolio Segments [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and leases	[1]	$ 626,350,782	$ 578,894,893
As a % of Total	[1]	99.18%	98.88%
Lease Residential and Consumer Portfolio Segments [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and leases	[1]	$ 5,162,181	$ 6,568,800
As a % of Total	[1]	0.82%	1.12%

[1] 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 troubled debt restructurings.

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