Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018	Aug. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	27.40%	30.60%	27.10%	32.60%
Deferred Income Tax Expense (Benefit)					$ 184,000
Effective Income Tax Rate Reconciliation, Percent			21.00%		35.00%
Income Tax Expense (Benefit)	$ 1,113,000	$ 993,000	$ 2,538,000	$ 2,310,000
Deferred Tax Assets, Valuation Allowance	$ 501,000		$ 501,000