Annual report pursuant to Section 13 and 15(d)

Geographic Information (Details)

v2.4.0.8
Geographic Information (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Assets $ 219,443,224       $ 216,662,200       $ 219,443,224 $ 216,662,200  
Revenues 176,134,000 161,649,000 126,253,000 110,136,000 156,591,000 163,906,000 164,100,000 146,573,000 574,171,249 631,170,565 728,200,318
United States
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Assets 201,025,592       198,485,075       201,025,592 198,485,075  
Revenues                 501,557,629 563,746,226 615,583,995
CANADA
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Assets 18,324,383       18,143,844       18,324,383 18,143,844  
Revenues                 68,797,187 60,589,842 110,594,062
Other Countries [Member]
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Assets 93,249       33,281       93,249 33,281  
Revenues                 $ 3,816,433 $ 6,834,497 $ 2,022,261