Note 6 - Common Stock and Stock Options (Detail) (USD $)				12 Months Ended	13 Months Ended			12 Months Ended			13 Months Ended					12 Months Ended						1 Months Ended		0 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 25, 2011	Dec. 31, 2012 PARS and Stock Options [Member] Long-Term Incentive Plan (LTIP) [Member]	Dec. 31, 2012 Performance Accelerated Restricted Stock Plan (PARS) [Member] Long-Term Incentive Plan (LTIP) [Member]	Dec. 31, 2012 Performance Accelerated Restricted Stock Plan (PARS) [Member] Accelerated Vesting If Certain Earnings Targets Are Achieved - Three Year Period [Member]	Dec. 31, 2012 Performance Accelerated Restricted Stock Plan (PARS) [Member] Accelerated Vesting If Certain Earnings Targets Are Achieved - Five Year Period [Member]	Dec. 31, 2012 Performance Accelerated Restricted Stock Plan (PARS) [Member] Accelerated Vesting If Certain Earnings Targets Are Achieved - Seven Year Period [Member]	Dec. 31, 2012 Performance Accelerated Restricted Stock Plan (PARS) [Member]	Dec. 25, 2011 Performance Accelerated Restricted Stock Plan (PARS) [Member]	Dec. 26, 2010 Performance Accelerated Restricted Stock Plan (PARS) [Member]	Dec. 31, 2012 Performance Accelerated Restricted Stock Plan (PARS) [Member]	Dec. 31, 2012 During Continued Employment [Member]	Dec. 31, 2012 Subsequent to Termination of Employment [Member]	Dec. 31, 2012 Exercisable During Lifetime of the Optionee [Member]	Dec. 31, 2012 Exercisable During Continued Employment of the Optionee and For a Three-Year Period Thereafter [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 25, 2011 Stock Options [Member]	Dec. 26, 2010 Stock Options [Member]	Dec. 31, 2012 Deferred Stock Units (DSU) [Member]	Dec. 25, 2011 Deferred Stock Units (DSU) [Member]	Dec. 26, 2010 Deferred Stock Units (DSU) [Member]	Sep. 30, 2012 Warrant Agreement with Berkshire Hathaway [Member]	May 31, 2012 Warrant Agreement with Berkshire Hathaway [Member]	Apr. 02, 2009 The Plan - 401(k) [Member] Prior to April 1, 2009 [Member]	Jan. 02, 2011 The Plan - 401(k) [Member] Effective January 1, 2011 [Member]	Dec. 31, 2012 The Plan - 401(k) [Member]	Dec. 25, 2011 The Plan - 401(k) [Member]	Dec. 26, 2010 The Plan - 401(k) [Member]	Dec. 31, 2012 Supplemental 401(k) Plan and the Director's Deferred Compensation Plan [Member]	Dec. 31, 2012 Common Class A [Member]	Dec. 25, 2011 Common Class A [Member]	Dec. 31, 2012 Plans Other Than LTIP [Member]
Election of Board of Directors, Percentage of Voting Rights																														30.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)																							4,600,000
Percentage of Outstanding Shares Represented by Number of Shares Warrants Entitle Holder to Purchase																							19.90%
Number Of Shares Purchased, Exercise of Warrants (in Shares)																						4,646,220
Common Stock, Par or Stated Value Per Share (in Dollars per share)																						$ 5.00								$ 5	$ 5
Proceeds from Warrant Exercises																						$ 46,462.20
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)																						0.01
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)			1,313,226	298,585
Share-based Compensation Arrangement by Share-based Payment Award, Options, Max Term												10 years	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)	2,099,000	2,602,000																														18,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)	1,724,000													400	17,400
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options																600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				5 years 219 days												1 year 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years	5 years	7 years				10 years
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized				1,200,000
Benefit Recognized Due to Unanticipated Volume of Forfeitures								100,000
Benefit Recognized Due to Unanticipated Volume of Forfeitures, After Tax								100,000
Allocated Share-based Compensation Expense									1,200,000	1,600,000						834,000	998,000	1,614,000	600,000	100,000
Allocated Share-based Compensation Expense, Net of Tax									800,000	1,000,000						531,000	636,000	1,028,000	400,000	100,000
Deferred Compensation Liability, Current and Noncurrent																										800,000	800,000
Deferred Compensation Plan Assets																										200,000	200,000
Deferred Compensation Plan, Benefits Recognized Due to Fluctuations in The Company's Stock Price Impacting Net Income																											100,000	200,000
Deferred Compensation Plan, Benefits Recognized Due to Fluctuations in The Company's Stock Price Impacting Net Income, Net of Tax																											100,000	100,000
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent																								5.00%	2.00%	2.00%
Period Over Which The Deferred Award Can Be Paid To The Outside Director Upon Retirement																			10 years
Allocated Share-based Compensation Benefit																					200,000
Allocated Share-based Compensation Benefit, Net of Tax																					100,000
Change in Stock Price, Increment Used to Determine Effect On Pretax Income																													1
Effect on Pretax Income Due to $1 Change in the Company's Stock Price																													$ 700,000