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Investments (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 27, 2015 | Jun. 28, 2014 | Mar. 28, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 463,000 |  | $ 136,000
Investments (Textual) [Abstract] |  |  |
Value of investments to be other-than-temporarily impaired | 0 |  |
Gross gains realized | 180,000 | $ 303,000 |
Gross losses realized | (46,000) | $ (68,000) |
Common stock of industrial and other companies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 5,500,000 |  | 5,400,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | (373,000) |  | (85,000)
Common stock of bank trust, insurance, and public utility companies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value | 100,000 |  | 100,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ (3,000) |  | $ (3,000)

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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