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Commercial Loans Receivables and Allowance for Loan Loss (Narrative) (Details) - USD ($) | 9 Months Ended |  |  |  |  |
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Dec. 29, 2018 | Sep. 29, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Apr. 01, 2017
Receivables [Abstract] |  |  |  |  |  |
Allowance for loan loss | $ 160,000 | $ 135,000 | $ 42,000 | $ 153,000 | $ 242,000 | $ 210,000
Due days for loans accounted for on a non-accrual basis and accruing loans with principal payments past | 90 days or more |  |  |  |  |
Due days for loans on nonaccrual status when interest is past due and remains unpaid | 90 days or more |  |  |  |  |
Percentage concentration of commercial loans receivables | 10.00% |  | 10.00% |  |  |

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- Definition Interest past due period for loan considered as nonaccrual. + References No definition available. + Details
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- Definition Principal past due period for loan considered as non performing. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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