BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Common Stock, no par value (in dollars per share)	$ 0.00	$ 0.00
Common Stock, authorized shares	100,000,000	100,000,000
Common Stock, outstanding shares	27,252,463	25,318,700
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 2,186,190	$ 2,078,944
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Common stock in treasury - at cost; outstanding	67,102	0
Class B
Preferred Stock, authorized shares	5,000,000	5,000,000
Preferred Stock, par value (in dollars per share)	$ 1.00	$ 1.00
Series I, Class B
Preferred Stock, outstanding shares	103,500	103,500
Preferred Stock, liquidation preference (in dollars)	646,875	646,875
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Series II, Class B
Preferred Stock, outstanding shares	178,700	178,700
Preferred Stock, liquidation preference (in dollars)	2,233,750	2,233,750
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Series III, Class B
Preferred Stock, outstanding shares	130,245	130,245
Preferred Stock, liquidation preference (in dollars)	1,628,063	1,628,063
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Series IV, Class B
Preferred Stock, outstanding shares	542,500	542,500
Preferred Stock, liquidation preference (in dollars)	5,967,500	5,967,500
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Series V, Class B
Preferred Stock, outstanding shares	46,607	46,607
Preferred Stock, liquidation preference (in dollars)	$ 205,071	$ 205,071
Preferred Stock, par value (in dollars per share)	$ 1	$ 1