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Deferred Tax Assets and liabilities (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Schedule Of Deferred Tax Assets [Line Items] |  |  |
Deferred Compensation | $ 0 | $ 301,000 | $ 314,000
Reserves on inventory and sales | 336,000 | 242,000 | 140,000
Credit and loss carryforwards | 692,000 | 545,000 | 178,000
Stock compensation | 0 | 0 | 601,000
Other | 690,000 | 516,000 | 77,000
Inventory Capitalization | 526,000 | 555,000 | 0
Sales tax accrual | 1,228,000 | 0 | 0
Total deferred tax assets | 3,472,000 | 2,159,000 | 1,310,000
Unrealized gain/loss on investments | (333,000) | (250,000) | (145,000)
Prepaid expenses | (752,000) | (426,000) | (429,000)
Depreciation | (7,729,000) | (8,075,000) | (1,317,000)
Stock compensation | (105,000) | (109,000) | 0
Total deferred tax liabilities | (8,919,000) | (8,860,000) | (1,891,000)
Net deferred tax liabilities | $ (5,447,000) | $ (6,701,000) | $ (581,000)

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