Stock Option - Plan Information (Details) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	May 31, 2020	Dec. 31, 2018	Dec. 31, 2012
Stock Option
Stock-based compensation expense, allocated		$ 303,000		$ 335,000	$ 610,000	$ 812,000
Basic earnings per share from share based compensation costs		$ 0.01		$ 0.01	$ 0.01	$ 0.02
Diluted earnings per share from share based compensation costs		$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.02
Proceeds from stock option exercises						$ 45,000
2012 Employee Stock Option Plan
Stock Option
Shares authorized (in shares)		1,900,000			1,900,000
Premium on fair market value (as a percent)					110.00%
Term					10 years
Vesting rights percentage					20.00%
Outstanding (in shares)	553,380	478,980		553,380	478,980	553,380	521,580	523,080
Exercisable, end of period	262,252	289,728		262,252	289,728	262,252
Available for grant (in shares)		0			0
Granted		0		0	0	37,500
Exercised		31,600		2,000	31,600	7,200
Number of Stock options settled by withholding of shares		20,567			20,567
Shares converted (in shares)				207
Deferred tax benefit		$ 52,000		$ 0	$ 52,000	$ 0
Unearned stock based compensation		$ 1,518,000			$ 1,518,000
Vested		74,000		80,400	84,700	92,700
Fair Value		$ 724,000		$ 754,000	$ 849,000	$ 883,000
Proceeds from stock option exercises		$ 0		$ 0	$ 0	$ 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	20,400	20,400	20,400
Exercisable, end of period	13,200	15,840		13,200	15,840	13,200
Available for grant (in shares)		0			0
Granted		0		0	0	0
Exercised		0		0	0	0
Deferred tax benefit		$ 0		$ 0	$ 0	$ 0
Unearned stock based compensation		$ 34,000			$ 34,000
Vested		1,920		1,920	1,920	1,920
Fair Value		$ 19,000		$ 19,000	$ 19,000	$ 19,000
Proceeds from stock option exercises		$ 0		$ 0	$ 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)	79,100	73,400		79,100	73,400	79,100	75,000	89,000
Exercisable, end of period	49,440	58,620		49,440	58,620	49,440
Available for grant (in shares)		0			0
Granted		0		0	0	0
Exercised		1,600		3,600	1,600	9,900
Number of Stock options settled by withholding of shares					740
Shares converted (in shares)				2,637		5,657
Deferred tax benefit		$ 6,000		$ 5,000		$ 26,000
Unearned stock based compensation		$ 83,000			$ 83,000
Vested		9,500			9,500	14,300
Fair Value		$ 89,000			$ 89,000	$ 114,000
Proceeds from stock option exercises		$ 0		$ 0	$ 0	$ 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			56,900
Exercisable, end of period		29,140			29,140
Available for grant (in shares)		43,100			43,100
Granted		0		0	0	25,000
Deferred tax benefit		$ 0		$ 0	$ 0	$ 0
Unearned stock based compensation		$ 278,000			$ 278,000
Vested		3,380		10,380	3,380	10,380
Fair Value		$ 34,000		$ 113,000	$ 34,000	$ 113,000
Proceeds from stock option exercises		$ 0		$ 0	$ 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			950,000		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)		10,000			10,000		5,000
Exercisable, end of period		2,000			2,000
Available for grant (in shares)		940,000			940,000
Granted		10,000			10,000
Exercised		0			0
Deferred tax benefit		$ 0			$ 0
Unearned stock based compensation		$ 73,000			$ 73,000
Vested		2,000			2,000
Fair Value		$ 19,500			$ 19,500
Proceeds from stock option exercises					$ 0
2022 Employee Stock Option Plan | Options granted after December 2032
Stock Option
Granted					0