CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 323,562	$ 222,726	$ 785,587	$ 624,101
Unrealized gain (loss) on available-for-sale securities:
Unrealized gains (losses) arising during the period, net of taxes (benefit) of $30,000 and ($17,000) for the three months ended January 31, 2017 and 2016, respectively, and $7,000 and ($28,000) for the six months ended January 31, 2017 and 2016, respectively.	57,219	(34,050)	13,229	(53,454)
Comprehensive income	$ 380,781	$ 188,676	$ 798,816	$ 570,647