CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
CONSOLIDATED BALANCE SHEETS
Allowance doubtful accounts	$ 15,600	$ 33,600	$ 15,600
Shareholders' equity:
Common stock,par value	$ 0.05	$ 0.05	$ 0.05
Common stock, authorized shares	30,000,000	20,000,000	20,000,000
Common stock, issued shares	10,145,211	7,023,401	7,023,401
Common stock, outstanding shares	10,145,211	7,003,599	7,003,599
Stock held in treasury, shares	0	19,802	19,802