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Supplemental Balance Sheet Disclosures - Property and Equipment (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Property and equipment          
Total $ 18,766,777   $ 18,766,777   $ 18,645,760
Less: accumulated depreciation and amortization (12,003,880)   (12,003,880)   (11,683,198)
Property and equipment, net 6,762,897   6,762,897   6,962,562
Depreciation and amortization for property and equipment 111,000 $ 117,000 330,000 $ 344,000  
Other assets          
Intangible assets, net of accumulated amortization of $531,637 and $529,037 at June 30, 2017 and September 30, 2016 68,600   68,600   71,200
Other non-current assets 131,674   131,674   85,748
Total other assets 200,274   200,274   156,948
Accumulated amortization of intangible assets 531,637   531,637   529,037
Impairment charges     0 0  
Intangible amortization expense 200 $ 7,200 2,600 12,000  
Land          
Property and equipment          
Total 1,021,245   1,021,245   1,021,245
Computer equipment          
Property and equipment          
Total 2,260,561   2,260,561   2,208,398
Corporate airplane          
Property and equipment          
Total 3,194,571   3,194,571   3,194,571
Depreciation and amortization for property and equipment     0 $ 0  
Furniture and office equipment          
Property and equipment          
Total 1,052,284   1,052,284   1,052,284
Manufacturing facility          
Property and equipment          
Total 5,733,312   5,733,312   5,733,313
Equipment          
Property and equipment          
Total $ 5,504,804   $ 5,504,804   $ 5,435,949