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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)

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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