Note 13 - Federal and State Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Alternative minimum tax credits	$ 2,911,031	$ 6,513,502
Historic tax credits	1,937,170
New markets tax credits		2,164,727
Net unrealized losses on securities available for sale and derivative instruments	1,687,162	498,860
Compensation	6,771,593	6,282,603
Loan/lease losses	9,548,985	8,029,714
Net operating loss carryforwards, federal and state	849,335	959,627
Other	52,738	34,962
Deferred tax assets	23,758,014	24,483,995
Premises and equipment	2,716,592	2,400,397
Equipment financing leases	18,329,372	15,367,705
Acquisition fair value adjustments	2,739,038	1,864,599
Investment accretion	30,533	30,656
Deferred loan origination fees, net	482,380	115,153
Other	424,335	430,125
Deferred tax liabilities	24,722,250	20,208,635
Net deferred tax liabilities		$ 4,275,360
Deferred tax liabilities	$ 964,236