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Deferred Tax Assets and liabilities (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Deferred Tax Assets [Line Items]      
Deferred compensation $ 0 $ 0 $ 301,000
Reserves on inventory and sales 332,000 336,000 242,000
Credit and loss carryforwards 413,000 692,000 545,000
Stock compensation 896,000 0 0
Accrued expenses and deferred costs 1,260,000 690,000 516,000
Inventory capitalization 337,000 526,000 555,000
Sales tax accrual 337,000 1,228,000 0
Total deferred tax assets 3,575,000 3,472,000 2,159,000
Unrealized gain/loss on investments (476,000) (333,000) (250,000)
Prepaid expenses (710,000) (752,000) (426,000)
Depreciation (7,091,000) (7,729,000) (8,075,000)
Stock compensation 0 (105,000) (109,000)
Total deferred tax liabilities (8,277,000) (8,919,000) (8,860,000)
Net deferred tax liabilities $ (4,702,000) $ (5,447,000) $ (6,701,000)