Note 3 - Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Equity Securities [Member]
Securities, continuous unrealized loss position, less than 12 months, fair value
Securities, continuous unrealized loss position, less than 12 months, unrealized losses
Securities, continuous unrealized loss position, 12 months or more, fair value	30,751	35,151
Securities, continuous unrealized loss position, 12 months or more, unrealized losses	(17,176)	(12,776)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	30,751	35,151
Securities, continuous unrealized loss position, unrealized losses	(17,176)	(12,776)
US States and Political Subdivisions Debt Securities [Member]
Securities, continuous unrealized loss position, less than 12 months, fair value	5,529,687	6,167,019
Securities, continuous unrealized loss position, less than 12 months, unrealized losses	(41,862)	(70,266)
Securities, continuous unrealized loss position, 12 months or more, fair value	182,900	715,410
Securities, continuous unrealized loss position, 12 months or more, unrealized losses	(524)	(15,542)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,712,587	6,882,429
Securities, continuous unrealized loss position, unrealized losses	(42,386)	(85,808)
US Government Agencies Debt Securities [Member]
Securities, continuous unrealized loss position, less than 12 months, fair value		6,399,920
Securities, continuous unrealized loss position, less than 12 months, unrealized losses		(83,965)
Securities, continuous unrealized loss position, 12 months or more, fair value		1,996,864
Securities, continuous unrealized loss position, 12 months or more, unrealized losses		(53,136)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value		8,396,784
Securities, continuous unrealized loss position, unrealized losses		(137,101)
Corporate Debt Securities [Member]
Securities, continuous unrealized loss position, less than 12 months, fair value		1,675,500
Securities, continuous unrealized loss position, less than 12 months, unrealized losses		(79,708)
Securities, continuous unrealized loss position, 12 months or more, fair value	3,019,725	2,138,200
Securities, continuous unrealized loss position, 12 months or more, unrealized losses	(88,091)	(72,311)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,019,725	3,813,700
Securities, continuous unrealized loss position, unrealized losses	(88,091)	(152,019)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities, continuous unrealized loss position, less than 12 months, fair value	22,214,153	33,072,102
Securities, continuous unrealized loss position, less than 12 months, unrealized losses	(110,431)	(493,865)
Securities, continuous unrealized loss position, 12 months or more, fair value	1,539,244	15,923,314
Securities, continuous unrealized loss position, 12 months or more, unrealized losses	(15,269)	(530,256)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	23,753,397	48,995,416
Securities, continuous unrealized loss position, unrealized losses	(125,700)	(1,024,121)
Securities, continuous unrealized loss position, less than 12 months, fair value	27,743,840	47,314,541
Securities, continuous unrealized loss position, less than 12 months, unrealized losses	(152,293)	(727,804)
Securities, continuous unrealized loss position, 12 months or more, fair value	4,772,620	20,808,939
Securities, continuous unrealized loss position, 12 months or more, unrealized losses	(121,060)	(684,021)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	32,516,460	68,123,480
Securities, continuous unrealized loss position, unrealized losses	$ (273,353)	$ (1,411,825)