Note 4 - Loans Leases Receivable - Changes in Accretable Yield (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Balance at the beginning of the period	$ (9,309,920)
Discount added at acquisition	(2,443,891)	(12,193,588)
Accretion recognized	5,282,604	2,883,668
Balance at the end of the period	(6,471,207)	(9,309,920)
Performing Financial Instruments [Member]
Balance at the beginning of the period	(9,115,614)
Discount added at acquisition	(2,223,989)	(11,916,009)
Accretion recognized	5,059,528	2,800,395
Balance at the end of the period	(6,280,075)	(9,115,614)
Receivables Acquired with Deteriorated Credit Quality [Member]
Balance at the beginning of the period	(194,306)
Discount added at acquisition	(219,902)	(277,579)
Accretion recognized	223,076	83,273
Balance at the end of the period	$ (191,132)	$ (194,306)