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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Stock Plans and Stock Compensation Expense Share-based Awards (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 26, 2020 USD ($) yr $ / shares shares	Dec. 28, 2019 USD ($) $ / shares shares	Dec. 29, 2018 USD ($) $ / shares shares	Dec. 30, 2017 days USD ($) $ / shares shares	Mar. 12, 2020 USD ($) $ / shares shares	Jul. 30, 2018 USD ($) $ / shares shares	Mar. 12, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding	461,000	570,000
Outstanding	360,000	461,000	570,000
Share-based Arrangements with Nonemployee Directors [Abstract]
Minimum Market Value Per Share, Calculation of Shares \| $ / shares	$ 5.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	(29,001)	(39,711)
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Awards, General Disclosures [Abstract]
Award Vesting Period	3 years
Restricted Stock Granted in Period					131,867	10,000	297,292
Grant Date Fair Value of Restricted Stock \| $					$ 132	$ 20	$ 832
Weighted Average Grant Date Fair Value of Restricted Stock \| $ / shares					$ 1.00	$ 2.00	$ 2.80
Share Based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	8 years 4 months 24 days		6 years 1 month 6 days
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	10 years 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding	461,423	569,998	433,841
Weighted Average Grant Date Fair Value of Outstanding Shares \| $ / shares	$ 4.30	$ 4.04	$ 6.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	131,867		307,292
Weighted Average Grant Date Fair Value Granted During the Year \| $ / shares	$ 1.00		$ 2.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(233,639)	(90,791)	(64,939)
Weighted Average Grant Date Fair Value of Awards Vested \| $ / shares	$ 3.90	$ 2.83	$ 6.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		(17,784)	(106,196)
Weighted Average Grant Date Fair Value of Forfeitures \| $ / shares		$ 3.48	$ 9.51
Outstanding	359,651	461,423	569,998	433,841
Weighted Average Grant Date Fair Value of Outstanding Shares \| $ / shares	$ 3.35	$ 4.30	$ 4.04	$ 6.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Nonvested Awards, Compensation Not yet Recognized \| $	$ 705
Nonvested Awards, Vested in Period, Fair Value \| $	$ 241	$ 94	$ 173
Primary Long-Term Incentive Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Awards, General Disclosures [Abstract]
Award Vesting Period	3 years
Stock Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Awards, General Disclosures [Abstract]
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 months 18 days
Share-based Arrangements with Nonemployee Directors [Abstract]
Nonemployee Directors Fees, Paid in Cash \| $	$ 18	18	18
Nonemployee Directors Fees, Value Received in Stock Performance Units \| $	$ 18	$ 18	$ 18
Stock Performance Units, Outstanding	130,320
Nonemployee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options \| $	$ 5
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Awards, General Disclosures [Abstract]
Award Vesting Period				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures				203,000
Options Granted, Weighted Average Exercise Price \| $ / shares	$ 0	$ 0	$ 0	$ 4.30
Share-based Compensation Arrangement by Share-based Award, Equity Instrument, Options, Grant Date Fair Value \| $				306
SharebasedCompensationArrangementbySharebasedPaymentAwardVestingMinimumSharePrice \| $ / shares				$ 7.00
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Common Stock Minimum Share Price, Trading Period \| days				5
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				5 years
Share-based Compensation Arrangement by Share-based Payment Award, Method of Measuring Cost of Award			lattice model
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding	166,000	298,500	306,500
Options Outstanding, Weighted Average Exercise Price \| $ / shares	$ 4.33	$ 4.55	$ 4.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0	0
Options Granted, Weighted Average Exercise Price \| $ / shares	$ 0	$ 0	$ 0	$ 4.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	0	0
Options Exercised, Weighted Average Exercise Price \| $ / shares	$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	(15,000)	(132,500)	(8,000)
Options Forfeitured and Expired, Weighted Average Exercise Price \| $ / shares	$ 4.17	$ 4.82	$ 4.17
Options Outstanding	151,000	166,000	298,500	306,500
Options Outstanding, Weighted Average Exercise Price \| $ / shares	$ 4.35	$ 4.33	$ 4.55	$ 4.54
Options Outstanding, Weighted Average Remaining Contractual Term
Options Exercisable	151,000	166,000	103,500
Options Exercisable, Weighted Average Exercise Price \| $ / shares	$ 4.35	$ 4.33	$ 5.00
Options Exercisable, Weighted Average Remaining Contractual Term	1 year 4 months 24 days
Options Outstanding, Intrinsic Value \| $	$ 0
Options Exercisable, Intrinsic Value \| $	0
Options Exercised in Period, Intrinsic Value \| $	$ 0	$ 0	$ 0
Age 60 or Older [Member] \| Career Shares Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Awards, General Disclosures [Abstract]
Award Vesting Period	2 years
Age Eligible for Retirement \| yr	60
Under Age 60 [Member] \| Career Shares Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Nonvested Awards, General Disclosures [Abstract]
Award Vesting Period	5 years
Age Eligible for Retirement \| yr	60