Note 5 - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net actuarial (gain) loss	$ (304,494)	$ (12,291)	$ 1,188,262
Recognized actuarial loss	(140,649)	(144,026)	(46,171)
Recognized prior service cost		(3,511)	(5,570)
Total recognized in other comprehensive income, before taxes	(445,143)	(159,828)	1,136,521
Total recognized in net benefit cost and other comprehensive income, before taxes	$ (247,915)	$ 50,934	$ 1,199,384