Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 101,154	$ 101,154
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	40,000,000
Common stock, shares issued (in shares)	28,515,888	25,908,978
Common stock, shares outstanding (in shares)	28,515,888	25,908,978
5% preferred stock [Member]
Preferred stock, par value (in dollars per share)	$ 25	$ 25
Preferred stock, shares authorized (in shares)	35,920	35,920
Preferred stock, shares issued (in shares)	2,427	2,427
Preferred stock, shares outstanding (in shares)	2,427	2,427
Series B Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	20,000	20,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Series C Preferred Stock [Member]
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	750	750
Preferred stock, shares issued (in shares)	375	375
Preferred stock, shares outstanding (in shares)	375	375