Annual report pursuant to Section 13 and 15(d)

Fair Value of Financial Instruments (Details Textual)

v3.8.0.1
Fair Value of Financial Instruments (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Fair Value Disclosures [Abstract]    
Realized gain (loss) on available for sale securities $ (679) $ (395)
Impairment charges 220 $ 276
Change in acquisition date fair value of contingent consideration $ 6,314