Cost of revenues and general and administrative expenses (Tables)

12 Months Ended

Dec. 31, 2012

Cost Of Revenues and General and Administrative Expenses [Abstract]

Schedule Of Cost Of Revenue [Table Text Block]

Cost of revenues and general and administrative expenses

	Year Ended December 31,
	2012		2011		2010
Cost of revenues consist of:
Electricity	$	14,473,583	$	12,622,788	$	10,132,956
Depreciation		6,959,912		5,537,098		5,854,297
Fuel oil		10,078,724		7,195,692		4,928,409
Employee costs		4,423,899		4,276,682		4,444,814
Cost of plant sales		-		61,843		1,833,835
Maintenance		2,849,453		2,140,776		2,541,927
Royalties		1,451,672		1,406,160		1,368,181
Insurance		1,625,733		1,545,771		1,490,121
Other		1,595,284		1,345,615		1,503,519
	$	43,458,260	$	36,132,425	$	34,098,059
General and administrative expenses consist of:
Employee costs	$	5,751,142	$	5,265,360	$	4,219,915
Insurance		968,662		965,003		951,715
Professional fees		2,097,294		3,112,678		2,805,146
Directors’ fees and expenses		608,429		551,132		519,786
Depreciation		421,851		252,303		340,969
Other		4,695,439		3,505,174		2,492,117
	$	14,542,817	$	13,651,650	$	11,329,648