BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 352,217	$ 205,822
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Common stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, authorized shares	100,000,000	100,000,000
Common Stock, issued shares	34,013,104	33,957,204
Common Stock, Shares, Outstanding	33,484,935	33,957,204
Common stock in treasury - at cost	(528,169)	0
Preferred Class B
Preferred stock, par value (in dollars per share)	$ 1.00
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
Series III, Class B
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, outstanding shares	76,245	106,745
Preferred Stock, liquidation preference (in dollars)	$ 953,063