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Cost of revenues and general and administrative expenses (Tables)
 12 Months Ended
Dec. 31, 2013
Cost of revenues and general and administrative expenses [Abstract]  
Cost Of Revenues And General And Administrative Expenses [Table Text Block]
 
 
 
Year ended December 31,
 
 
 
2013
 
2012
 
2011
 
Cost of revenues consist of:
 
 
 
 
 
 
 
 
 
 
Electricity
 
$
13,634,617
 
$
14,473,583
 
$
12,622,788
 
Depreciation
 
 
4,822,967
 
 
6,959,912
 
 
5,537,098
 
Fuel oil
 
 
10,106,409
 
 
10,078,724
 
 
7,195,692
 
Employee costs
 
 
4,422,093
 
 
4,423,899
 
 
4,276,682
 
Maintenance
 
 
2,332,893
 
 
2,849,453
 
 
2,140,776
 
Royalties
 
 
1,357,988
 
 
1,451,672
 
 
1,406,160
 
Insurance
 
 
1,499,201
 
 
1,625,733
 
 
1,545,771
 
Other
 
 
2,140,084
 
 
1,595,284
 
 
1,407,458
 
 
 
$
40,316,252
 
$
43,458,260
 
$
36,132,425
 
 
 
 
 
 
 
 
 
 
 
 
General and administrative expenses consist of:
 
 
 
 
 
 
 
 
 
 
Employee costs
 
$
6,218,948
 
$
5,751,142
 
$
5,265,360
 
Insurance
 
 
969,370
 
 
968,662
 
 
965,003
 
Professional fees
 
 
1,798,939
 
 
2,097,294
 
 
3,112,678
 
Directors’ fees and expenses
 
 
853,478
 
 
608,429
 
 
551,132
 
Depreciation
 
 
290,622
 
 
421,851
 
 
252,303
 
Other
 
 
5,712,946
 
 
4,695,439
 
 
3,505,174
 
 
 
$
15,844,303
 
$
14,542,817
 
$
13,651,650