Note 13 - Federal and State Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Alternative minimum tax credits	$ 6,513,502	$ 6,513,502
New markets tax credits	2,164,727	1,797,587
Net unrealized losses on securities available for sale and derivative instruments	498,860	1,470,759
Compensation	6,282,603	8,737,976
Loan/lease losses	8,029,714	10,479,227
Net operating loss carryforwards, federal and state	959,627	1,879,746
Other	34,962	247,594
	24,483,995	31,126,391
Premises and equipment	2,400,397	4,899,107
Equipment financing leases	15,367,705	22,050,540
Acquisition fair value adjustments	1,864,599	1,336,338
Investment accretion	30,656	46,581
Deferred loan origination fees, net	115,153	261,915
Other	430,125	456,219
	20,208,635	29,050,700
Net deferred tax assets	$ 4,275,360	$ 2,075,691