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SCHEDULE I: CONDENSED FINANCIAL INFORMATION OF REGISTRANT - STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 26, 2018
Sep. 26, 2018
Jun. 27, 2018
Mar. 28, 2018
Dec. 27, 2017
Sep. 27, 2017
Jun. 28, 2017
Mar. 29, 2017
Dec. 26, 2018
Dec. 27, 2017
Dec. 28, 2016
Condensed Statement of Income Captions [Line Items]                      
Net income $ (548,000) $ 6,946,000 $ 10,571,000 $ 4,979,000 $ (11,032,000) $ 7,870,000 $ 8,184,000 $ 3,682,000 $ 21,948,000 $ 8,884,000 $ 22,146,000
Available-for-sale Securities:                      
Change in net unrealized holding (losses) [1]                 (3,000) (94,000) (35,000)
Less: reclassification adjustments for net realized losses included in net income [1]                 16,000 47,000 19,000
OTHER COMPREHENSIVE LOSS, NET OF TAX                 13,000 (47,000) (16,000)
COMPREHENSIVE INCOME                 21,961,000 8,837,000 22,130,000
Income tax benefit                 0 0 0
Parent Company                      
Condensed Statement of Income Captions [Line Items]                      
Net income                 15,179,000 (320,000) 12,446,000
Available-for-sale Securities:                      
Change in net unrealized holding (losses) [1]                 (3,000) (67,000) (22,000)
Less: reclassification adjustments for net realized losses included in net income [1]                 13,000 33,000 12,000
OTHER COMPREHENSIVE LOSS, NET OF TAX [1]                 10,000 (34,000) (10,000)
COMPREHENSIVE INCOME                 $ 15,189,000 (354,000) 12,436,000
Income tax benefit                   $ 0 $ 0
[1] Net of tax benefit of $0 for fiscal years ended December 26, 2018, December 27, 2017 and December 28, 2016.