Note 3 - Loans Leases Receivable - Changes in Accretable Yield (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Balance at the beginning of the period	$ (6,471,207)	$ (9,309,920)
Accretion recognized	654,768	2,238,230
Balance at the end of the period	(5,816,439)	(7,071,690)
Performing Financial Instruments [Member]
Balance at the beginning of the period	(6,280,075)	(9,115,614)
Accretion recognized	620,532	2,171,540
Balance at the end of the period	(5,659,543)	(6,944,074)
Financial Asset Acquired with Credit Deterioration [Member]
Balance at the beginning of the period	(191,132)	(194,306)
Accretion recognized	34,236	66,690
Balance at the end of the period	$ (156,896)	$ (127,616)