Stock Options (Stock Option Activity) (Details) - USD ($)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Stock Options [Abstract]
Shares under option, number of shares (in shares)	920,911	1,058,911
Exercised, number of shares (in shares)	(65,000)	(87,000)
Expired, number of shares (in shares)	(200,000)
Forfeited, number of shares (in shares)		(51,000)
Shares under option, number of shares (in shares)	655,911	920,911	1,058,911
Exercisable, number of shares (in shares)	501,911	532,245
Shares under option, stock options price range, lower limit (in dollars per share)	$ 1.73	$ 1.73
Shares under option, stock options price range, upper limit (in dollars per share)	2.92	2.92
Exercised, stock options price range, lower limit (in dollars per share)	1.73	1.73
Exercised, stock options price range, upper limit (in dollars per share)	2.65	2.65
Expired, stock options price range, lower limit (in dollars per share)	2.92
Forfeited, stock options price range, lower limit (in dollars per share)		1.73
Forfeited, stock options price range, upper limit (in dollars per share)		2.65
Shares under option, stock options price range, lower limit (in dollars per share)	1.73	1.73	$ 1.73
Shares under option, stock options price range, upper limit (in dollars per share)	2.65	2.92	2.92
Exercisable, stock options price range, lower limit (in dollars per share)	1.73	1.73
Exercisable, stock options price range, upper limit (in dollars per share)	2.65	2.92
Shares under option, weighted average exercise price (in dollars per share)	2.21	2.18
Exercised, weighted average exercise price (in dollars per share)	2.08	1.97
Expired, weighted average exercise price (in dollars per share)	2.92
Forfeited, weighted average exercise price (in dollars per share)		1.92
Shares under option, weighted average exercise price (in dollars per share)	2.01	2.21	$ 2.18
Exercisable, weighted average exercise price (in dollars per share)	$ 2.05	$ 2.38
Shares under option, weighted average remaining contractual life (Year)	1 year 7 months 24 days	2 years 2 months 15 days	3 years 8 months 19 days
Exercisable, weighted average remaining contractual life (Year)	1 year 2 months 8 days	1 year 3 months 18 days
Shares under option, aggregate intrinsic value of in-the-money options	$ 1,602,600	$ 1,373,117	$ 5,055,797
Exercisable, aggregate intrinsic value of in-the-money options	$ 1,202,985	$ 700,947