Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.7.0.1
Fair Value of Financial Instruments (Details Textual) - USD ($)
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Other Income And Other Expense [Line Items]    
Realized gain (loss) on available for sale securities $ (267,000) $ (63,000)
Impairment charges 220,000 $ 0
Nonrecurring [Member]    
Other Income And Other Expense [Line Items]    
Fair value adjustments for assets measured at fair value 0  
Fair value adjustments for liabilities measured at fair value $ 0