BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized shares	100,000,000	100,000,000
Common stock, issued shares	34,024,304
Common stock, outstanding shares	29,937,159	33,484,935
Common stock in treasury - at cost, shares	4,087,145	528,169
Preferred, Class B
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, authorized shares	5,000,000	5,000,000
Series II, Class B
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, outstanding shares	156,200	156,200
Preferred stock, liquidation preference (in dollars)	$ 1,952,500	$ 1,952,500
Series III, Class B
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, outstanding shares	76,245	76,245
Preferred stock, liquidation preference (in dollars)	$ 953,063	$ 953,063