Income Taxes (Narrative) (Details) - USD ($) $ in Thousands				12 Months Ended
	Oct. 02, 2020	Mar. 27, 2020	Mar. 26, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2014
Income Tax [Line Items]
Income tax provision (benefit)				$ (1,687)	$ 4,416
Income tax paid, net (refund)				(1,675)	901
Net operating loss carryforward				5,842	3,662
Changes in valuation allowance				170	318
Income tax, interest expense				179	253
Income tax, penality expense				15
Income tax examination accrued interest and penalty				477	$ 282
Tax benefit expected to be recognized from the release of an uncertain tax reserve				$ 2,575
The CARES Act [Member]
Income Tax [Line Items]
Temporary net operating loss carry back term				5 years
Additional tax depreciation		$ 1,017
Net operating loss		$ 6,829
Other Deferred Tax Assets [Member]
Income Tax [Line Items]
Changes in valuation allowance				$ 28
Leasehold Improvements [Member]
Income Tax [Line Items]
Estimated useful life			39 years
Leasehold Improvements [Member] | The CARES Act [Member]
Income Tax [Line Items]
Estimated useful life		15 years
Leasehold improvements, percentage of eligibility for tax bonus depreciation		100.00%
Federal [Member]
Income Tax [Line Items]
Net operating loss carryforward				27,764
Federal [Member] | Net Operating Loss Carryforward Expiring In 2037 [Member]
Income Tax [Line Items]
Net operating loss carryforward				17,528
Federal [Member] | Net Operating Loss Carryforward With No Expiration [Member]
Income Tax [Line Items]
Net operating loss carryforward				$ 10,236
Net operating loss maximum annual utilization of taxable income, percent				80.00%
State and Local Jurisdiction [Member] | Net Operating Loss Carryforward Expiring In 2039 [Member]
Income Tax [Line Items]
State net operating loss carryforward				$ 380
Loss Carried Back to 2014 [Member]
Income Tax [Line Items]
U.S. corporate income tax rate						35.00%
Loss Carried Back to 2014 [Member] | The CARES Act [Member]
Income Tax [Line Items]
Proceeds from income tax refunds	$ 2,425