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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |
Net Operating Loss Carryforwards Used In The Current Period | $ 3,800,000 | $ 8,600,000
Deferred income tax assets: |  |
Allowance for uncollectible accounts receivable | 342,000 | 348,000
Accrued compensation expense | 5,001,000 | 3,954,000
Inventory differences | 2,317,000 | 1,949,000
Net operating loss carry-forwards | 18,060,000 | 19,622,000
Deferred revenue | 280,000 | 237,000
Stock-based compensation expense | 2,704,000 | 2,465,000
Uncertain tax positions | 559,000 | 709,000
Federal research and development credit carry-forward | 569,000 | 0
Other | 3,197,000 | 3,762,000
Total deferred income tax assets | 33,029,000 | 33,046,000
Deferred income tax liabilities: |  |
Prepaid expenses | (751,000) | (757,000)
Property and equipment | (21,893,000) | (19,001,000)
Intangible assets | (3,837,000) | (4,107,000)
Other | (1,295,000) | (1,116,000)
Total deferred income tax liabilities | (27,776,000) | (24,981,000)
Valuation allowance | (1,363,000) | (1,225,000)
Net deferred income tax assets | 3,890,000 | 6,840,000
Reported as: |  |
Deferred income tax assets - Current | 5,638,000 | 4,976,000
Deferred income tax assets - Long-term | 800,000 | 4,237,000
Deferred income tax liabilities - Long-term | $ (2,548,000) | $ (2,373,000)

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