Stock Option - Plan Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	May 31, 2020	Dec. 31, 2018	Dec. 31, 2012
Stock Option
Stock-based compensation expense, allocated		$ 307,000	$ 477,000
Basic earnings per share from share based compensation costs		$ 0.01	$ 0.01
Diluted earnings per share from share based compensation costs		$ 0.01	$ 0.01
Exercised		0
Proceeds from stock option exercises			$ 45,000
2012 Employee Stock Option Plan
Stock Option
Shares authorized (in shares)		1,900,000
Premium on fair market value (as a percent)		110.00%
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		521,580	555,380			523,080
Exercisable, end of period		258,328	183,852
Available for grant (in shares)		0
Granted		0	37,500
Exercised		0	5,200
Deferred tax benefit			$ 0
Unearned stock based compensation		$ 1,738,000
Vested		10,700	12,300
Fair Value		$ 124,000	$ 129,000
Proceeds from stock option exercises			$ 45,000
2012 Employee Stock Option Plan | Options granted after December 2022
Stock Option
Granted		0
2012 Non-Employee Stock Option Plan
Stock Option
Shares authorized (in shares)									100,000
Threshold percentage of voting rights		10.00%
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		20,400	20,400	20,400	20,400
Exercisable, end of period		13,920	11,280
Available for grant (in shares)		0
Granted		0	0
Exercised		0	0
Deferred tax benefit		$ 0	$ 0
Unearned stock based compensation		$ 40,000
Vested		0	0
Proceeds from stock option exercises		$ 0	$ 0
2012 Non-Employee Stock Option Plan | Options granted after December 2022
Stock Option
Granted		0
2018 Non-Employee Stock Option Plan
Stock Option
Shares authorized (in shares)								100,000
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		75,000	82,700	75,000	89,000
Exercisable, end of period		50,720	38,740
Available for grant (in shares)		0
Granted		0	0
Exercised		0	6,300
Shares converted (in shares)			3,020
Deferred tax benefit			$ 21,000
Unearned stock based compensation		$ 104,000
Vested		0	0
Proceeds from stock option exercises			$ 0
2018 Non-Employee Stock Option Plan | Options granted after December 2028
Stock Option
Granted		0
2020 Non-Employee Stock Option Plan
Stock Option
Shares authorized (in shares)							100,000
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		56,900	51,900	56,900		26,900
Exercisable, end of period		25,760	14,380
Available for grant (in shares)		43,100
Granted		0	25,000
Exercised		0	0
Deferred tax benefit		$ 0	$ 0
Unearned stock based compensation		$ 312,000
Vested		7,000	7,000
Fair Value		$ 79,000	$ 79,000
Proceeds from stock option exercises		$ 0	$ 0
2020 Non-Employee Stock Option Plan | Options granted after May 2030
Stock Option
Granted		0
2022 Employee Stock Option Plan
Stock Option
Shares authorized (in shares)	950,000
Premium on fair market value (as a percent)	110.00%
Threshold percentage of voting rights	10.00%
Term	10 years
Vesting rights percentage	20.00%
Outstanding (in shares)		0		5,000
Available for grant (in shares)		950,000
Granted		0
Exercised		0
Deferred tax benefit		$ 0
Unearned stock based compensation		$ 0
Vested		0
Proceeds from stock option exercises		$ 0
2022 Employee Stock Option Plan | Options granted after December 2032
Stock Option
Granted		0