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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
Sep. 30, 2016
Sep. 30, 2015
Deferred Tax Assets:    
Accrued liabilities and reserves $ 331,000 $ 255,000
Allowance for doubtful accounts 70,000 133,000
Inventory 632,000  
R&D tax credits carryforwards 871,000 1,114,000
Stock-based compensation 140,000 194,000
Net operating losses carryforwards 73,000 48,000
Unrealized loss on investments 85,000 1,023,000
Other 62,000 14,000
Gross Deferred Tax Assets 2,264,000 2,781,000
Deferred and Other Tax Liabilities:    
Domestic international sales corporation (577,000)  
Inventory   (43,000)
Percentage of completion (1,158,000) (415,000)
Property and equipment (683,000) (806,000)
Unrecognized tax benefits (150,000) (150,000)
Other (12,000) (36,000)
Gross Deferred and Other Tax Liabilities (2,580,000) (1,450,000)
Net Deferred and Other Income Tax Liabilities $ (316,000)  
Net Deferred and Other Income Tax Assets   $ 1,331,000