Income Taxes (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019	Aug. 31, 2019
Income Taxes
Effective Income Tax Rate Reconciliation, Percent			21.00%		35.00%
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	$ 0		$ 0
Income Tax Expense (Benefit)	$ 683,000	$ 1,113,000	$ 2,693,000	$ 2,538,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	28.00%	27.40%	30.00%	27.10%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

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