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Note 6 - Net Periodic Benefit Cost (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 04, 2015
Sep. 28, 2014
Oct. 04, 2015
Sep. 28, 2014
Defined Benefit Retirement Plan Europe [Member]        
Service cost $ 265,000 $ 176,000 $ 799,000 $ 539,000
Interest cost 2,124,000 2,664,000 6,328,000 8,028,000
Expected return on assets (2,279,000) (2,988,000) (6,791,000) (9,008,000)
Amortization of prior service cost 8,000 10,000 25,000 38,000
Recognized net actuarial losses 244,000 164,000 725,000 492,000
Net periodic benefit cost 362,000 26,000 1,086,000 89,000
Salary Continuation Plan SCP [Member]        
Service cost 148,000 125,000 445,000 375,000
Interest cost 278,000 268,000 834,000 803,000
Amortization of prior service cost 0 6,000 0 18,000
Net periodic benefit cost 557,000 466,000 1,671,000 1,397,000
Amortization of loss $ 131,000 $ 67,000 $ 392,000 $ 201,000