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Deferred Tax Assets (Liabilities) (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Deferred Tax Assets [Line Items]      
Reserves on inventory and sales $ 199,000 $ 291,000 $ 332,000
Credit and loss carryforwards 735,000 699,000 413,000
Stock compensation 1,149,000 1,283,000 896,000
Accrued expenses and deferred costs 1,068,000 3,170,000 1,260,000
Inventory capitalization 49,000 142,000 337,000
Sales tax accrual 0 8,000 337,000
Unrealized gain/loss on investments 85,000 0 0
Total deferred tax assets 3,285,000 5,593,000 3,575,000
Unrealized gain/loss on investments 0 (294,000) (476,000)
Prepaid expenses (755,000) (779,000) (710,000)
Depreciation (6,189,000) (6,285,000) (7,091,000)
Foreign currency (23,000) 0 0
Total deferred tax liabilities (6,967,000) (7,358,000) (8,277,000)
Net deferred tax liabilities $ (3,682,000) $ (1,765,000) $ (4,702,000)