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Investments (Tables) | 12 Months Ended
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Mar. 28, 2015
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments [Table Text Block] | Investments consist of the following (in thousands):
| March 28, 2015 |  | March 29, 2014
Available-for-sale investment securities | $ | 21,283 |  |  | $ | 19,802 |
Non-marketable equity investments | 10,636 |  |  | 5,652 |
| $ | 31,919 |  |  | $ | 25,454 |
Available-for-Sale Securities by Investment Category | The following tables summarize the Company’s available-for-sale investment securities, gross unrealized gains and losses and fair value, aggregated by investment category (in thousands):
| March 28, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 1,952 |  |  | $ | 1 |  |  | $ | (5 | ) |  | $ | 1,948 |
Residential mortgage-backed securities | 4,342 |  |  | 23 |  |  | (27 | ) |  | 4,338 |
State and political subdivision debt securities | 7,190 |  |  | 245 |  |  | (12 | ) |  | 7,423 |
Corporate debt securities | 1,060 |  |  | 2 |  |  | (4 | ) |  | 1,058 |
Marketable equity securities | 4,962 |  |  | 642 |  |  | (88 | ) |  | 5,516 |
Certificates of deposit | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
| $ | 20,506 |  |  | $ | 913 |  |  | $ | (136 | ) |  | $ | 21,283 |
| March 29, 2014
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 2,318 |  |  | $ | 1 |  |  | $ | (46 | ) |  | $ | 2,273 |
Residential mortgage-backed securities | 3,754 |  |  | 13 |  |  | (149 | ) |  | 3,618 |
State and political subdivision debt securities | 5,923 |  |  | 155 |  |  | (13 | ) |  | 6,065 |
Corporate debt securities | 1,550 |  |  | 24 |  |  | — |  |  | 1,574 |
Marketable equity securities | 4,537 |  |  | 758 |  |  | (73 | ) |  | 5,222 |
Certificates of deposit | 1,050 |  |  | — |  |  | — |  |  | 1,050 |
| $ | 19,132 |  |  | $ | 951 |  |  | $ | (281 | ) |  | $ | 19,802 |
Investment Securities in a Continuous Unrealized Loss Position | The following tables show the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):
| March 28, 2015
| Less than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury and government debt securities | $ | 499 |  |  | $ | — |  |  | $ | 698 |  |  | $ | (5 | ) |  | $ | 1,197 |  |  | $ | (5 | )
Residential mortgage-backed securities | 438 |  |  | (2 | ) |  | 330 |  |  | (25 | ) |  | 768 |  |  | (27 | )
State and political subdivision debt securities | 1,099 |  |  | (6 | ) |  | 256 |  |  | (6 | ) |  | 1,355 |  |  | (12 | )
Corporate debt securities | 247 |  |  | (4 | ) |  | — |  |  | — |  |  | 247 |  |  | (4 | )
Marketable equity securities | 1,067 |  |  | (85 | ) |  | 100 |  |  | (3 | ) |  | 1,167 |  |  | (88 | )
| $ | 3,350 |  |  | $ | (97 | ) |  | $ | 1,384 |  |  | $ | (39 | ) |  | $ | 4,734 |  |  | $ | (136 | )
| March 29, 2014
| Less than 12 Months |  | 12 Months or Longer |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
U.S. Treasury and government debt securities | $ | 1,562 |  |  | $ | (40 | ) |  | $ | 344 |  |  | $ | (6 | ) |  | $ | 1,906 |  |  | $ | (46 | )
Residential mortgage-backed securities | 2,553 |  |  | (149 | ) |  | — |  |  | — |  |  | 2,553 |  |  | (149 | )
State and political subdivision debt securities | 507 |  |  | (13 | ) |  | — |  |  | — |  |  | 507 |  |  | (13 | )
Marketable equity securities | 1,101 |  |  | (73 | ) |  | — |  |  | — |  |  | 1,101 |  |  | (73 | )
| $ | 5,723 |  |  | $ | (275 | ) |  | $ | 344 |  |  | $ | (6 | ) |  | $ | 6,067 |  |  | $ | (281 | )
Contractual Maturity of Investment Securities | The amortized cost and fair value of the Company’s investments in debt securities, by contractual maturity, are shown in the table below (in thousands). Expected maturities differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| March 28, 2015 |  | March 29, 2014
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in less than one year | $ | 1,804 |  |  | $ | 1,821 |  |  | $ | 2,006 |  |  | $ | 2,017 |
Due after one year through five years | 2,834 |  |  | 2,844 |  |  | 2,908 |  |  | 2,949 |
Due after five years through ten years | 2,467 |  |  | 2,452 |  |  | 924 |  |  | 872 |
Due after ten years | 7,439 |  |  | 7,650 |  |  | 7,707 |  |  | 7,692 |
| $ | 14,544 |  |  | $ | 14,767 |  |  | $ | 13,545 |  |  | $ | 13,530 |

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