Stock Options - Plan Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	May 31, 2020	Dec. 31, 2018	Dec. 31, 2012
Stock Options
Stock-based compensation expense, allocated		$ 1,733,000	$ 1,464,000	$ 1,649,000
Basic earnings per share from share based compensation costs		$ 0.05	$ 0.04	$ 0.04
Diluted earnings per share from share based compensation costs		$ 0.05	$ 0.04	$ 0.04
Proceeds from stock option exercises		$ 427,000	$ 85,000	$ 155,000
Director [Member]
Stock Options
Exercised		153,644	53,000	34,800
Number of Stock options settled by withholding of shares		115,644	43,600	6,800
2012 Employee Stock Option Plan
Stock Options
Shares authorized (in shares)		1,900,000
Threshold percentage of voting rights		10.00%
Premium on fair market value (as a percent)		110.00%
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		363,036	521,580	523,080	214,080
Exercisable, end of period		190,960	247,628	176,752
Available for grant (in shares)		0
Granted		0	37,500	338,000
Exercised		147,544	39,000	29,000
Number of Stock options settled by exchange of shares				1,000
Number of Stock options settled by withholding of shares			29,600
Withheld (in shares)		46,570		153
Shares converted (in shares)		10,150
Proceeds from stock option exercises		$ 427,000	$ 84,000	$ 155,000
Deferred tax benefit		119,000	0	$ 0
Unearned stock based compensation		$ 1,094,000	$ 1,971,000
Vested		101,876	109,876	107,576
Fair Value		$ 946,000	$ 981,000	$ 1,040,000
2012 Non-Employee Stock Option Plan
Stock Options
Shares authorized (in shares)								100,000
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		20,400	20,400	20,400	12,000
Exercisable, end of period		16,560	13,920	11,280
Available for grant (in shares)		0
Granted		0	0	9,600
Exercised		0	0	1,200
Number of Stock options settled by withholding of shares		109,544
Proceeds from stock option exercises		$ 0	$ 0	$ 0
Deferred tax benefit		0	$ 0	$ 4,000
Conversion of stock, shares issued			258
Unearned stock based compensation		$ 24,000	$ 46,000
Vested		2,640	2,640	6,240
Fair Value			$ 24,000	$ 39,000
2018 Non-Employee Stock Option Plan
Stock Options
Shares authorized (in shares)							100,000
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		68,900	75,000	89,000	70,100
Exercisable, end of period		59,500	50,720	45,040
Available for grant (in shares)		0
Granted		0	0	23,500
Exercised		6,100	14,000	4,600
Withheld (in shares)		2,700
Proceeds from stock option exercises		$ 0	$ 0	$ 0
Deferred tax benefit		$ 30,000	$ 44,000	$ 12,000
Conversion of stock, shares issued		7,235	2,075
Unearned stock based compensation		$ 59,000	$ 135,000
Vested		14,880	19,680	19,680
Fair Value		$ 124,000	$ 149,000	$ 160,000
2020 Non-Employee Stock Option Plan
Stock Options
Shares authorized (in shares)						100,000
Term		10 years
Vesting rights percentage		20.00%
Outstanding (in shares)		56,900	56,900	26,900	10,000
Exercisable, end of period		30,140	18,760	7,380
Available for grant (in shares)		43,100
Granted		0	30,000	16,900
Exercised		0	0	0
Unearned stock based compensation		$ 215,000	$ 344,000
Vested		11,380	11,380	5,380
Fair Value		$ 129,000	$ 129,000	$ 55,000
2022 Employee Stock Option Plan
Stock Options
Shares authorized (in shares)	950,000
Threshold percentage of voting rights	10.00%
Premium on fair market value (as a percent)	110.00%
Term	10 years
Vesting rights percentage	20.00%
Outstanding (in shares)		130,000	5,000
Exercisable, end of period		26,000	1,000
Available for grant (in shares)		820,000
Granted		130,000	5,000
Exercised			0
Unearned stock based compensation		$ 2,066,000	$ 74,000
Vested		26,000	1,000
Fair Value		$ 553,000	$ 20,000