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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
Sep. 30, 2018
Sep. 30, 2017
Deferred Tax Assets:    
Accrued liabilities and reserves $ 218,000 $ 351,000
Allowance for doubtful accounts 71,000 73,000
Inventory 494,000 778,000
R&D tax credits carryforwards 87,000 155,000
Stock-based compensation 104,000 95,000
Net operating losses carryforwards 57,000 58,000
Other   48,000
Gross Deferred Income Tax Assets 1,031,000 1,558,000
Deferred and Other Tax Liabilities:    
Domestic international sales corporation (543,000) (839,000)
Percentage of completion (1,717,000) (1,114,000)
Property and equipment (904,000) (694,000)
Unrealized gain on investments (75,000) (332,000)
Unrecognized tax benefits (150,000) (150,000)
Other   (30,000)
Gross Deferred and Other Income Tax Liabilities (3,389,000) (3,159,000)
Net Deferred and Other Income Tax Assets (Liabilities) $ (2,358,000) $ (1,601,000)