Note 6 - Stock Based Compensation (Details) (USD $)	9 Months Ended					0 Months Ended			1 Months Ended	9 Months Ended		1 Months Ended	3 Months Ended				12 Months Ended	0 Months Ended	7 Months Ended	9 Months Ended	12 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended		0 Months Ended	9 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended					12 Months Ended
	Sep. 27, 2014	Sep. 27, 2014 Employee Stock Option [Member] The 1995 Plan, 1997 Plan, and 2005 Plan [Member]	Sep. 27, 2014 Employee Stock Option [Member]	Sep. 28, 2013 Employee Stock Option [Member]	Sep. 27, 2014 Stock Appreciation Rights (SARs) [Member] The 1995 Plan, 1997 Plan, and 2005 Plan [Member]	Dec. 04, 2014 Restricted Stock Units (RSUs) [Member] Officers and Key Employees [Member] The 2005 Plan [Member]	Dec. 04, 2012 Restricted Stock Units (RSUs) [Member] Officers and Key Employees [Member] The 2005 Plan [Member]	Feb. 13, 2014 Restricted Stock Units (RSUs) [Member] Officers and Key Employees [Member]	Jul. 31, 2013 Restricted Stock Units (RSUs) [Member] Officer [Member] The 2005 Plan [Member]	Sep. 27, 2014 Restricted Stock Units (RSUs) [Member]	Sep. 27, 2014 Stock Options and RSUs [Member]	Jun. 30, 2011 Performance Shares [Member] Chief Executive Officer [Member]	Jun. 28, 2014 Performance Shares [Member] Chief Executive Officer [Member]	Jun. 29, 2013 Performance Shares [Member] Chief Executive Officer [Member]	Jun. 29, 2013 Performance Shares [Member] Chief Executive Officer [Member]	Jun. 29, 2012 Performance Shares [Member] Chief Executive Officer [Member]	Dec. 31, 2013 Performance Shares [Member] Officers and Key Employees [Member] The 2005 Plan [Member]	Feb. 13, 2014 Performance Shares [Member] Officers and Key Employees [Member]	Sep. 27, 2014 Performance Shares [Member] Officers and Key Employees [Member]	Sep. 27, 2014 Performance Shares [Member]	Dec. 31, 2013 Performance Shares [Member]		Jun. 29, 2013 Time-based Stock Options [Member] Chief Executive Officer [Member]	Sep. 27, 2014 Time-based Stock Options [Member]	Dec. 31, 2013 Time-based Stock Options [Member]		Feb. 16, 2012 Time-based Restricted Stock Units (RSUs) [Member] Officers and Employees [Member] The 2005 Plan [Member]	Sep. 27, 2014 Time-based Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Time-based Restricted Stock Units (RSUs) [Member]		Feb. 16, 2012 Performance-base Restricted Stock Units (RSUs) [Member] Officers and Employees [Member] The 2005 Plan [Member]	Dec. 31, 2013 Performance-base Restricted Stock Units (RSUs) [Member] Officers and Employees [Member] The 2005 Plan [Member]	Dec. 31, 2013 Performance-base Restricted Stock Units (RSUs) [Member] Officers and Key Employees [Member] The 2005 Plan [Member]	Sep. 27, 2014 The 1995 Plan [Member]	Sep. 27, 2014 The 1997 Plan [Member]	Sep. 27, 2014 The 2005 Plan [Member]	Dec. 31, 2013 Employee Stock Purchase Plan [Member]	Sep. 27, 2014 Employee Stock Purchase Plan [Member]
Note 6 - Stock Based Compensation (Details) [Line Items]
Number of Equity Compensation Plans	2
Number of Equity Compensation Plans Terminated	2
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance																																		4,913,000	5,100,000	24,850,000		6,694,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years												10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years								3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					0		660,000	825,000	20,000																		661,000	2,785,000	2,949,000		220,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award																																					271,000
Employee Stock Purchase Plan ESPP, Weighted-average Purchase Price Per Share (in Dollars per share)																																					$ 1.64
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (in Dollars)	$ 0
Estimated Annual Forfeiture Rate											2.50%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period														83,000			229,000			42,000	125,000	[1]	125,000	677,000	355,000	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross												250,000												3,000	13,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)														$ 3.24										$ 1.91	$ 2.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)			$ 0.97	$ 1.37										$ 2.62				$ 1.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period													42,000		42,000	83,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period																			10,000									390,000	144,000	[1]		155,000
Percentage of Restricted Stock Units Will Have Time-based Vesting Conditions						50.00%		50.00%
Percentage of Restricted Stock Units Will Have Performance Based Vesting Conditions							50.00%	50.00%
Percentage of Performance Metrics Achieved																	34.80%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period																												2,215,000	1,539,000				111,000

[1] In the second quarter of 2013, 125 time-based and 83 (125 at maximum performance achievement) market performance-based stock options were rescinded with the consent of and without payment to the Chief Executive Officer (CEO) due to the fact that the original grants with respect to which these options were a part of exceeded the sub-limits of the applicable plan by the number of shares as to which the options were rescinded.