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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Accounts receivable, due to allowance for doubtful accounts $ 313,000 $ 355,000
Inventories 289,000 283,000
Operating loss carry-forwards 1,011,000 2,674,000
Stock-based compensation expense 1,194,000 1,197,000
Intangible assets due to differences in amortization 74,000 56,000
Research and development, alternative minimum tax credit carry-forwards 3,507,000 3,838,000
Foreign tax credit carry-forwards 1,111,000 1,146,000
State tax credit carry-forwards 2,228,000 2,415,000
Accrued expenses 688,000 741,000
Gross deferred tax assets 10,415,000 12,705,000
Less valuation allowance (2,136,000) (2,576,000)
Total deferred tax assets 8,279,000 10,129,000
Deferred tax liabilities:    
Purchased intangible assets (433,000) (543,000)
Property and equipment, due to differences in depreciation (3,176,000) (2,900,000)
Total deferred tax liabilities (3,609,000) (3,443,000)
Net deferred tax assets 4,670,000 6,686,000
Net deferred tax asset—current 1,145,600 1,281,327
Net deferred tax asset—noncurrent $ 3,523,691 $ 5,405,492