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Deferred Tax (Tables)
6 Months Ended
Jun. 30, 2012
Deferred Tax Liability

As of June 30, 2012 and December 31, 2011, deferred tax liability consisted of the following:

 

    2012     2011  
Deferred tax asset — noncurrent (accrual of system maintenance cost)   $ 38,317     $ 33,146  
                 
Deferred tax asset — noncurrent (depreciation of fixed assets)     24,255,713       25,527,126  
Deferred tax liability — noncurrent (net investment in sales-type leases)     (30,663,065 )     (31,948,809 )
Deferred tax liability, net of deferred tax asset – noncurrent   $ (6,369,035 )   $ (6,388,537 )
 Deferred tax liability — current (net investment in sales-type leases)   $ (2,179,262 )   $ (1,624,665 )