Employee Stock Compensation and Stock Repurchase Program (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	$ 98,642	$ (52,510)	$ 197,490	$ 77,933
Total income tax benefit recognized for stock-based compensation arrangements	35,511	(13,888)	71,096	33,072
2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	0	(13,932)	206	(10,137)
2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	$ 98,642	$ (38,578)	$ 197,284	$ 88,070