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Supplemental Balance Sheet Disclosures - Property and Equipment (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Property and equipment          
Total $ 18,885,137   $ 18,885,137   $ 18,756,406
Less: accumulated depreciation and amortization (12,296,329)   (12,296,329)   (12,087,395)
Property and equipment, net 6,588,808   6,588,808   6,669,011
Depreciation and amortization for property and equipment 106,000 $ 111,000 209,000 $ 219,000  
Other assets          
Intangible assets, net of accumulated amortization of $531,637 at March 31, 2018 and September 30, 2017, respectively 68,600   68,600   68,600
Other non-current assets 117,100   117,100   118,715
Total other assets 185,700   185,700   187,315
Accumulated amortization of intangible assets 531,637   531,637   531,637
Impairment charges     0 0  
Amortization expense 0 $ 0 0 0  
Land          
Property and equipment          
Total 1,021,245   1,021,245   1,021,245
Computer equipment          
Property and equipment          
Total 2,315,949   2,315,949   2,247,866
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 1,051,637   1,051,637   1,051,637
Manufacturing facility          
Property and equipment          
Total 5,733,313   5,733,313   5,733,313
Equipment          
Property and equipment          
Total $ 5,568,422   $ 5,568,422   $ 5,507,774