Accounting for Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 01, 2021	Mar. 01, 2020	Jul. 08, 2019	Jul. 31, 2021	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020	Feb. 28, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense							$ 473	$ 686
Stock grants vested	100,000	100,000
Shares withheld for taxes	39,347
Patrick M. Lavelle [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual salary and cash bonus			$ 1,000
Stock based compensation expense					$ 61	$ 61	$ 122	$ 122
Grant of market stock units maximum amount			$ 5,000
Maximum average stock price of grant market stock units			$ 5.49
Maximum increase amount of market stock units award			$ 5,000
Maximum threshold share price increases in value of award			$ 15.00
Estimated Maximum threshold share increases in value of award			333,333
Patrick M. Lavelle [Member] | Common Class A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 4.15	$ 4.15	$ 4.15	$ 4.15
Award vesting period			5 years
Grant of initial shares under employment agreement	60,653	100,000
Stock based compensation expense					$ 38	$ 103	$ 78	$ 206
Patrick M. Lavelle [Member] | Common Class A [Member] | March 1, 2021 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional grant of shares under employment agreement			100,000
Patrick M. Lavelle [Member] | Common Class A [Member] | March 1, 2020 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional grant of shares under employment agreement			100,000
Patrick M. Lavelle [Member] | Common Class A [Member] | March 1, 2022 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional grant of shares under employment agreement			100,000
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated Share-based Compensation Expense					237	$ 335	473	$ 686
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized					$ 1,656		$ 1,656
2014 Plan [Member] | Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period									3 years
Share-based payment award vesting age of employee									65 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 13.59
Stock grants vested							136,008
Vested and unsettled awards, weighted average fair value							$ 5.50
2014 Plan [Member] | Restricted Stock Units [Member] | Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted				48,527
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 13.59
2014 Plan [Member] | Restricted Stock Units [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award vesting required service period									10 years
2014 Plan [Member] | Unsettled Stock Grants and RSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock grants vested							414,326
Vested and unsettled awards, weighted average fair value							$ 6.98
2012 Equity Incentive Plan [Member] | Patrick M. Lavelle [Member] | Common Class A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant of initial shares under employment agreement			200,000