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Maintenance Reserves and Accrued Maintenance Costs (1) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accrued maintenance cost [Roll Forward]    
Balance, beginning of period $ 878,700 $ 1,013,400
Additions [Abstract]    
Charged to expense 2,692,600 754,800
Reversals of previously accrued maintenance costs (287,400) (300)
Total maintenance expense 2,405,200 754,500
Capital equipment 384,800 46,000
Accrued claims related to refundable maintenance reserves 262,900 292,300
Prepaid maintenance and other 90,500 122,500
Total additions 3,143,400 1,215,300
Deductions [Abstract]    
Payments 1,413,900 1,026,200
Other 0 217,000
Total deductions 1,413,900 1,243,200
Net increase/(decrease) in accrued maintenance costs 1,729,500 (27,900)
Balance, end of period $ 2,608,200 $ 985,500