Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	2,086,000	2,086,000
Preferred stock, liquidation preference, value	$ 2,519,080	$ 2,519,080
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	39,052,472	39,052,472
Common stock, shares outstanding	36,297,576	36,297,576
Treasury stock, shares	686,706	607,161
Corporate Debt Securities [Member]
Unamortized discount	$ 1,194	$ 2,153
Convertible Senior Debentures [Member]
Unamortized discount	$ 43,026	$ 71,394