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Taxes (Details 3) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Current deferred tax assets      
Inventory and revenue related $ 5,202,000 $ 4,031,000  
Bonuses, commissions, and other compensation 1,273,000 1,029,000  
Other 1,283,000 1,242,000  
Gross current deferred tax assets 7,758,000 6,302,000  
Valuation allowance (878,000) 0  
Net current deferred tax assets 6,880,000 6,302,000  
Noncurrent deferred tax assets:      
Federal and state tax credit carryforwards 12,274,000 11,482,000  
Stock-based compensation expense 6,160,000 5,830,000  
Deprecation 1,798,000 1,950,000  
Acquired completed technologies and other intangible assets 1,519,000 1,870,000  
Unrealized investment gains and losses 891,000 934,000  
Correlative tax relief and deferred interest related to reserves 609,000 655,000  
Capital loss carryforward 373,000 373,000 373,000
Acquired in-process technology 178,000 303,000  
Other 1,928,000 1,430,000  
Gross noncurrent deferred tax assets 25,730,000 24,827,000  
Noncurrent deferred tax liabilities:      
Nondeductible intangible assets (6,244,000) (7,543,000)  
Other (1,045,000) (1,356,000)  
Gross noncurrent deferred tax liabilities (7,289,000) (8,899,000)  
Valuation allowance (2,522,000) (373,000) (373,000)
Net noncurrent deferred tax assets $ 15,919,000 $ 15,555,000