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Income Taxes (Significant Components of Deferred Tax Assets) (Details) - USD ($)
Oct. 18, 2015
Apr. 24, 2015
Deferred tax assets (liabilities):    
Foreign net operating loss carryforwards $ 1,940,719 $ 1,906,364
State net operating loss carryforwards 68,170 70,129
Tax credit carryforwards 4,029,615 3,059,133
Deferred compensation 6,229,967 6,847,074
Accruals and reserves 1,705,728 3,003,760
Licensing income and expense (164,972) (285,597)
Property and equipment (450,141) (630,789)
Other 542,794 919,272
Total deferred tax assets 13,901,880 14,889,346
Deferred tax valuation allowance (2,398,063) (1,612,766)
Net deferred tax assets $ 11,503,817 $ 13,276,580