Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity - USD ($)	3 Months Ended											12 Months Ended
	Jan. 03, 2016		Oct. 04, 2015	Jul. 05, 2015	Apr. 05, 2015	Dec. 28, 2014		Sep. 28, 2014	[2]	Jun. 29, 2014	Mar. 30, 2014	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance					$ 306,639,000							$ 306,639,000
Net income	$ 18,247,000	[1]	$ 20,127,000	$ 21,722,000	12,322,000	$ 8,088,000	[1]	$ (376,000)		$ 13,071,000	$ 4,025,000	72,418,000	$ 24,808,000	$ 48,255,000
Pension liability adjustment												6,072,000	(15,280,000)	1,409,000
Foreign currency translation adjustment												(32,575,000)	(28,351,000)	(5,241,000)
Foreign currency translation adjustment												(6,619,000)
Balance	342,366,000					306,639,000						342,366,000	306,639,000
Common Stock [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance					$ 6,597,000						$ 6,631,000	$ 6,597,000	$ 6,631,000	$ 6,606,000
Balance (in Shares)					65,968,000						66,311,000	65,968,000	66,311,000	66,062,000
Net income												$ 0	$ 0	$ 0
Stock issuances under employee option plans												$ 4,000	$ 5,000	$ 20,000
Stock issuances under employee option plans (in Shares)												39,000	55,000	201,000
Other issuances of common stock												$ 59,000	$ 49,000	$ 67,000
Other issuances of common stock (in Shares)												597,000	489,000	670,000
Unamortized stock compensation expense related to restricted stock awards												$ 0	$ 0	$ 0
Cash dividends paid												0	0	0
Cash dividends paid												0	0	0
Forfeitures and compensation expense related to stock awards												$ (25,000)	$ (38,000)	$ (62,000)
Forfeitures and compensation expense related to stock awards (in Shares)												(253,000)	(387,000)	(622,000)
Share repurchases												$ (65,000)	$ (50,000)
Share repurchases (in Shares)												(650,000)	(500,000)
Pension liability adjustment												$ 0	$ 0	$ 0
Pension liability adjustment												0	0	0
Foreign currency translation adjustment												0	0	0
Foreign currency translation adjustment												0	0	0
Other												$ 0	$ 0	$ 0
Other (in Shares)												0	0	0
Balance	$ 6,570,000					$ 6,597,000						$ 6,570,000	$ 6,597,000	$ 6,631,000
Balance (in Shares)	65,701,000					65,968,000						65,701,000	65,968,000	66,311,000
Additional Paid-in Capital [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance					$ 368,603,000						$ 374,597,000	$ 368,603,000	$ 374,597,000	$ 366,677,000
Net income												0	0	0
Stock issuances under employee option plans												355,000	381,000	1,814,000
Other issuances of common stock												9,746,000	10,361,000	10,805,000
Unamortized stock compensation expense related to restricted stock awards												(9,806,000)	(10,410,000)	(10,872,000)
Cash dividends paid												0	0	0
Cash dividends paid												0	0	0
Forfeitures and compensation expense related to stock awards												14,670,000	1,293,000	6,173,000
Share repurchases												(13,241,000)	(7,619,000)
Pension liability adjustment												0	0	0
Foreign currency translation adjustment												0	0	0
Other												0	0	0
Balance	$ 370,327,000					$ 368,603,000						370,327,000	368,603,000	374,597,000
Retained Earnings [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance					39,737,000						24,226,000	39,737,000	24,226,000	(16,746,000)
Net income												72,418,000	24,808,000	48,255,000
Stock issuances under employee option plans												0	0	0
Other issuances of common stock												0	0	0
Unamortized stock compensation expense related to restricted stock awards												0	0	0
Cash dividends paid												(11,885,000)	(9,297,000)	(7,283,000)
Cash dividends paid												11,885,000	9,297,000	7,283,000
Forfeitures and compensation expense related to stock awards												0	0	0
Share repurchases												0	0
Pension liability adjustment												0	0	0
Foreign currency translation adjustment												0	0	0
Other												0	0	0
Balance	100,270,000					39,737,000						100,270,000	39,737,000	24,226,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance					(49,362,000)						(34,082,000)	(49,362,000)	(34,082,000)	(35,491,000)
Net income												0	0	0
Stock issuances under employee option plans												0	0	0
Other issuances of common stock												0	0	0
Unamortized stock compensation expense related to restricted stock awards												0	0	0
Cash dividends paid												0	0	0
Cash dividends paid												0	0	0
Forfeitures and compensation expense related to stock awards												0	0	0
Share repurchases												0	0
Pension liability adjustment												6,072,000	(15,280,000)	1,409,000
Foreign currency translation adjustment												0	0	0
Other												0	0	0
Balance	(43,290,000)					(49,362,000)						(43,290,000)	(49,362,000)	(34,082,000)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Note 10 - Shareholders' Equity (Details) - Activity of Shareholders' Equity [Line Items]
Balance					$ (58,936,000)						$ (30,585,000)	(58,936,000)	(30,585,000)	(25,344,000)
Net income												0	0	0
Stock issuances under employee option plans												0	0	0
Other issuances of common stock												0	0	0
Unamortized stock compensation expense related to restricted stock awards												0	0	0
Cash dividends paid												0	0	0
Cash dividends paid												0	0	0
Forfeitures and compensation expense related to stock awards												0	0	0
Share repurchases												0	0
Pension liability adjustment												0	0	0
Foreign currency translation adjustment												(32,575,000)	(28,351,000)	(5,241,000)
Other												0	0	0
Balance	$ (91,511,000)					$ (58,936,000)						$ (91,511,000)	$ (58,936,000)	$ (30,585,000)

[1] Results for the fourth quarter of 2014 include debt retirement expenses of $12.0 million.

[2] Results for the third quarter of 2014 include restructuring and asset impairment charges of $12.4 million.