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
	Jul. 08, 2019	Jul. 31, 2019	Aug. 31, 2019	Aug. 31, 2019	Aug. 31, 2018	Feb. 28, 2015
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
Stock based compensation expense				$ 1,345	$ 234
2012 Equity Incentive Plan [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				$ 4.52
Vested and unissued shares				277,696
Vested and unissued shares, weighted average fair value				$ 3.99
Supplemental Executive Retirement Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested and unissued shares				234,433
Vested and unissued shares, weighted average fair value				$ 7.55
Patrick M. Lavelle [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Salary and cash bonus	$ 1,000
Stock based compensation expense	40
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
Maximum threshold share price half of the award can be granted	$ 13.00
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
Award vesting period	5 years
Stock based compensation expense			$ 155	$ 155
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
Patrick M. Lavelle [Member] | Common Class A [Member] | 2012 Equity Incentive Plan [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
Grant of initial shares under employment agreement	200,000
Stock based compensation expense			$ 830	$ 830
Restricted Stock [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		71,352
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 4.65
Allocated Share-based Compensation Expense			1,186	1,345
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 3,410	$ 3,410
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based payment award vesting required service period						10 years