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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
Sep. 30, 2015
Sep. 30, 2014
Deferred Tax Assets:    
Accrued liabilities and reserves $ 255,000 $ 288,000
Allowance for doubtful accounts 133,000 91,000
Inventory   186,000
R&D tax credits carryforwards 1,114,000 671,000
Stock-based compensation 194,000 194,000
Net operating losses carryforwards 48,000 58,000
Unrealized loss on investments 1,023,000  
Other 14,000 24,000
Gross Deferred Tax Assets 2,781,000 1,512,000
Deferred and Other Tax Liabilities:    
Unrealized gain on investments   (798,000)
Inventory (43,000)  
Percentage of completion (415,000) (104,000)
Property and equipment (806,000) (964,000)
Unrecognized tax benefits (150,000) (300,000)
Other (36,000) (39,000)
Gross Deferred and Other Tax Liabilities (1,450,000) (2,205,000)
Net Deferred and Other Income Tax Assets $ 1,331,000  
Net deferred and other income tax liabilities   $ (693,000)