General and Administrative Expenses (Tables)

12 Months Ended

Dec. 31, 2015

General and Administrative Expenses [Abstract]

General and Administrative Expenses

	2013		2014		2015
Share based compensation	$	2,066,688	$	2,247,002	$	678,721
Executive services		3,013,000		2,939,560		2,743,150
Non-executive directors' remuneration		176,559		210,637		211,031
Office rent		21,268		24,924		20,709
Travel expenses		95,778		61,114		47,132
Personnel and other expenses		50,302		89,031		46,284
Professional services		1,358,530		1,227,830		1,114,104
Directors and officers insurance		92,951		84,405		69,011
Stock market annual fees		126,191		123,216		128,438
Other expenses		274,677		224,670		164,501
Total	$	7,275,944	$	7,232,389	$	5,223,081