Condensed Consolidated Statement of Stockholders' Equity - USD ($)	Common Stock	Additional Paid-In Capital	Retained Earnings / Accumulated Deficit	Total
Beginning balance, shares at Aug. 31, 2017	17,277,604
Beginning balance, value at Aug. 31, 2017	$ 7,278	$ 12,109,141	$ 13,688,468	$ 25,804,887
Exercise of stock options, shares	7,792
Exercise of stock options, value	$ 8	27,530		27,538
Stock-based compensation		130,221		130,221
Shares issued to directors for services, shares	2,256
Shares issued to directors for services, value	$ 2	36,771		36,773
Declaration of dividend			(1,037,088)	(1,037,088)
Net income			1,716,606	1,716,006
Ending balance, shares at Nov. 30, 2017	17,287,652
Ending balance, value at Nov. 30, 2017	$ 7,288	12,303,663	14,367,386	26,678,337
Beginning balance, shares at Aug. 31, 2017	17,277,604
Beginning balance, value at Aug. 31, 2017	$ 7,278	12,109,141	13,688,468	25,804,887
Net income				7,596,828
Ending balance, shares at May. 31, 2018	17,358,444
Ending balance, value at May. 31, 2018	$ 7,359	12,933,561	18,167,905	31,108,825
Beginning balance, shares at Nov. 30, 2017	17,287,652
Beginning balance, value at Nov. 30, 2017	$ 7,288	12,303,663	14,367,386	26,678,337
Exercise of stock options, shares	35,293
Exercise of stock options, value	$ 36	142,261		142,297
Stock-based compensation		141,496		141,496
Shares issued to directors for services, shares	2,277
Shares issued to directors for services, value	$ 2	36,771		36,773
Declaration of dividend			(1,039,065)	(1,039,065)
Net income			3,474,787	3,474,787
Ending balance, shares at Feb. 28, 2018	17,325,222
Ending balance, value at Feb. 28, 2018	$ 7,326	12,624,191	16,803,108	29,434,625
Exercise of stock options, shares	30,990
Exercise of stock options, value	$ 31	140,219		140,250
Stock-based compensation		132,437		132,437
Shares issued to directors for services, shares	2,232
Shares issued to directors for services, value	$ 2	36,714		36,716
Declaration of dividend			(1,041,240)	(1,041,240)
Net income			2,406,037	2,406,037
Ending balance, shares at May. 31, 2018	17,358,444
Ending balance, value at May. 31, 2018	$ 7,359	12,933,561	18,167,905	31,108,825
Exercise of stock options, shares	55,931
Exercise of stock options, value	$ 56	325,443		325,499
Stock-based compensation		157,924		157,924
Shares issued to directors for services, shares	2,070
Shares issued to directors for services, value	$ 2	36,740		36,742
Declaration of dividend			(1,044,347)	(1,044,347)
Net income			1,337,982	1,337,982
Ending balance, shares at Aug. 31, 2018	17,416,445
Ending balance, value at Aug. 31, 2018	$ 7,417	13,453,668	18,461,540	31,922,625
Exercise of stock options, shares	41,103
Exercise of stock options, value	$ 42	357,410		357,452
Stock-based compensation		200,029		200,029
Shares issued to directors for services, shares	2,222
Shares issued to directors for services, value	$ 2	44,904		44,906
Adjustment for 606 at Nov. 30, 2018			(692,944)	(692,944)
Declaration of dividend			(1,045,073)	(1,045,073)
Net income			1,535,947	1,535,947
Ending balance, shares at Nov. 30, 2018	17,459,770
Ending balance, value at Nov. 30, 2018	$ 7,461	14,056,011	18,259,470	32,322,942
Beginning balance, shares at Aug. 31, 2018	17,416,445
Beginning balance, value at Aug. 31, 2018	$ 7,417	13,453,668	18,461,540	31,922,625
Net income				6,524,102
Ending balance, shares at May. 31, 2019	17,527,983
Ending balance, value at May. 31, 2019	$ 7,531	14,813,016	21,147,834	35,968,381
Beginning balance, shares at Nov. 30, 2018	17,459,770
Beginning balance, value at Nov. 30, 2018	$ 7,461	14,056,011	18,259,470	32,322,942
Exercise of stock options, shares	37,680
Exercise of stock options, value	$ 38	121,912		121,950
Stock-based compensation		208,715		208,715
Shares issued to directors for services, shares	2,508
Shares issued to directors for services, value	$ 4	48,954		48,958
Declaration of dividend			(1,048,887)	(1,048,887)
Net income			2,099,449	2,099,449
Ending balance, shares at Feb. 28, 2019	17,499,958
Ending balance, value at Feb. 28, 2019	$ 7,503	14,435,592	19,310,032	33,753,127
Exercise of stock options, shares	25,849
Exercise of stock options, value	$ 26	103,747		103,773
Stock-based compensation		224,654		224,654
Shares issued to directors for services, shares	2,176
Shares issued to directors for services, value	$ 2	49,023		49,025
Declaration of dividend			(1,050,904)	(1,050,904)
Net income			2,888,706	2,888,706
Ending balance, shares at May. 31, 2019	17,527,983
Ending balance, value at May. 31, 2019	$ 7,531	$ 14,813,016	$ 21,147,834	$ 35,968,381