Accounting for Stock-Based Compensation - Additional Information (Details) - USD ($)				1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 28, 2023	Feb. 06, 2023	Jul. 08, 2019	Jul. 31, 2023	May 31, 2024	May 31, 2023	Feb. 28, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense					$ 146,000	$ 258,000
Allocated share-based compensation expense					146,000	258,000
Annual salary	$ 750,000
Cash equivalent share grant	250,000
Patrick M. Lavelle [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual salary and cash bonus			$ 1,000,000
Stock based compensation expense					$ 0	23,000
Grant of market stock units maximum amount			$ 5,000,000
Maximum average stock price of grant market stock units			$ 5.49
Maximum increase amount of market stock units award			$ 5,000,000
Maximum threshold share price increases in value of award			$ 15
Share-Based compensation arrangement by share based payment award grant of market stock units, vesting percentage					20.00%
Share-based compensation arrangement by share based payment award grant of market stock units vesting amount					$ 1,000,000
Patrick M. Lavelle [Member] | Common Class A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			5 years
Allocated share-based compensation expense					59,000
Beat Kahli [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Annual salary		$ 300,000
Allocated share-based compensation expense					4,000	$ 97,000
Beat Kahli [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		$ 10.66
Beat Kahli [Member] | Common Class A [Member] | Seventh Year [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional grant of shares under employment agreement		20,000
Ms. Shelton
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash equivalents	$ 100,000
Ms. Shelton | Common Class A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			5 years
Allocated share-based compensation expense					24,000
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized					$ 720,000
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
2014 Plan [Member] | Restricted Stock Units [Member] | Employees [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock issued during period, shares, restricted stock award, gross				18,116
Share-based Compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value				$ 9.89
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					605,295
Vested and unsettled awards, weighted average fair value					$ 6.23
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
2012 Equity Incentive Plan [Member] | 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
2012 Equity Incentive Plan [Member] | 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
2012 Equity Incentive Plan [Member] | 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