Note 4 - Loans Leases Receivable - Leases By Delinquency Status (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable, Net of Deferred Income	$ 3,644,099,503	$ 2,956,713,493
Nonperforming Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income	29,225,555	18,642,377
Commercial Lease Residential And Consumer Portfolio Segments [Member] | Delinquency Status [Member]
Loans and Leases Receivable, Net of Deferred Income	635,054,140	585,463,693
Commercial Lease Residential And Consumer Portfolio Segments [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and Leases Receivable, Net of Deferred Income	630,452,297	578,894,893
Commercial Lease Residential And Consumer Portfolio Segments [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income	4,601,843	6,568,800
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income	1,380,542,524	1,134,516,315
Commercial Portfolio Segment [Member] | Delinquency Status [Member]
Loans and Leases Receivable, Net of Deferred Income	98,823,351	66,758,397
Commercial Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and Leases Receivable, Net of Deferred Income	98,150,050	65,847,177
Commercial Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income	673,301	911,220
Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income	8,724,447	6,455,535
Finance Leases Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income	126,751,783	141,448,232
Finance Leases Portfolio Segment [Member] | Delinquency Status [Member]
Loans and Leases Receivable, Net of Deferred Income	126,751,783	141,448,232
Finance Leases Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and Leases Receivable, Net of Deferred Income	124,621,386	137,778,740
Finance Leases Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income	2,130,397	3,669,492
Finance Leases Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income	2,130,397	3,669,492
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income	309,287,535	258,646,265
Residential Portfolio Segment [Member] | Delinquency Status [Member]
Loans and Leases Receivable, Net of Deferred Income	309,287,535	258,646,265
Residential Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and Leases Receivable, Net of Deferred Income	307,737,383	256,935,447
Residential Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income	1,550,152	1,710,818
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income	1,550,152	1,710,818
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Net of Deferred Income	100,191,471	118,610,799
Consumer Portfolio Segment [Member] | Delinquency Status [Member]
Loans and Leases Receivable, Net of Deferred Income	100,191,471	118,610,799
Consumer Portfolio Segment [Member] | Performing Less Than Ninety Days Past Due [Member}
Loans and Leases Receivable, Net of Deferred Income	99,943,478	118,333,529
Consumer Portfolio Segment [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Loans and Leases Receivable, Net of Deferred Income	247,993	277,270
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans and Leases Receivable, Net of Deferred Income	$ 247,993	$ 277,270
Commercial and Commercial Real Estate Portfolio Segments [Member] | Delinquency Status [Member]
Financing Receivables Portfolio Percentage	100.00%	100.00%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Performing Less Than Ninety Days Past Due [Member}
Financing Receivables Portfolio Percentage	99.28%	98.88%
Commercial and Commercial Real Estate Portfolio Segments [Member] | Non Performing Greater Than Ninety Days Past Due [Member]
Financing Receivables Portfolio Percentage	0.72%	1.12%