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Investments (Tables) | 9 Months Ended
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Dec. 30, 2017
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | Investments Investments consist of the following (in thousands):
| December 30, 2017 |  | April 1, 2017
Available-for-sale investment securities | $ | 30,487 |  |  | $ | 24,162 |
Non-marketable equity investments | 18,646 |  |  | 17,383 |
| $ | 49,133 |  |  | $ | 41,545 |
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):
| December 30, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 300 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 296 |
Residential mortgage-backed securities | 7,510 |  |  | 1 |  |  | (104 | ) |  | 7,407 |
State and political subdivision debt securities | 6,924 |  |  | 142 |  |  | (142 | ) |  | 6,924 |
Corporate debt securities | 1,658 |  |  | 2 |  |  | (23 | ) |  | 1,637 |
Marketable equity securities | 7,627 |  |  | 3,947 |  |  | (113 | ) |  | 11,461 |
Certificates of deposit | 2,762 |  |  | — |  |  | — |  |  | 2,762 |
| $ | 26,781 |  |  | $ | 4,092 |  |  | $ | (386 | ) |  | $ | 30,487 |
| April 1, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 650 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 649 |
Residential mortgage-backed securities | 5,646 |  |  | 3 |  |  | (90 | ) |  | 5,559 |
State and political subdivision debt securities | 7,195 |  |  | 145 |  |  | (117 | ) |  | 7,223 |
Corporate debt securities | 1,698 |  |  | 4 |  |  | (23 | ) |  | 1,679 |
Marketable equity securities | 5,752 |  |  | 2,430 |  |  | (130 | ) |  | 8,052 |
Certificates of deposit | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
| $ | 21,941 |  |  | $ | 2,582 |  |  | $ | (361 | ) |  | $ | 24,162 |
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):
| December 30, 2017
| 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 | $ | 296 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | — |  |  | $ | 296 |  |  | $ | (4 | )
Residential mortgage-backed securities | 3,308 |  |  | (32 | ) |  | 3,860 |  |  | (72 | ) |  | 7,168 |  |  | (104 | )
State and political subdivision debt securities | 2,649 |  |  | (22 | ) |  | 2,309 |  |  | (120 | ) |  | 4,958 |  |  | (142 | )
Corporate debt securities | 1,012 |  |  | (8 | ) |  | 372 |  |  | (15 | ) |  | 1,384 |  |  | (23 | )
Marketable equity securities | 1,032 |  |  | (91 | ) |  | 104 |  |  | (22 | ) |  | 1,136 |  |  | (113 | )
| $ | 8,297 |  |  | $ | (157 | ) |  | $ | 6,645 |  |  | $ | (229 | ) |  | $ | 14,942 |  |  | $ | (386 | )
| April 1, 2017
| 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 | $ | 349 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 349 |  |  | $ | (1 | )
Residential mortgage-backed securities | 3,449 |  |  | (38 | ) |  | 1,962 |  |  | (52 | ) |  | 5,411 |  |  | (90 | )
State and political subdivision debt securities | 1,948 |  |  | (36 | ) |  | 2,084 |  |  | (81 | ) |  | 4,032 |  |  | (117 | )
Corporate debt securities | 1,424 |  |  | (23 | ) |  | — |  |  | — |  |  | 1,424 |  |  | (23 | )
Marketable equity securities | 1,393 |  |  | (90 | ) |  | 157 |  |  | (40 | ) |  | 1,550 |  |  | (130 | )
| $ | 8,563 |  |  | $ | (188 | ) |  | $ | 4,203 |  |  | $ | (173 | ) |  | $ | 12,766 |  |  | $ | (361 | )
Based on the Company's ability and intent to hold the investments for a reasonable period of time sufficient for a forecasted recovery of fair value, the Company does not consider any investments to be other-than-temporarily impaired at December 30, 2017. As of December 30, 2017 and April 1, 2017, the Company's investments in marketable equity securities consist of investments in common stock of industrial and other companies. 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.
| December 30, 2017
| Amortized Cost |  | Fair Value
Due in less than one year | $ | 280 |  |  | $ | 279 |
Due after one year through five years | 4,223 |  |  | 4,157 |
Due after five years through ten years | 2,602 |  |  | 2,536 |
Due after ten years | 9,287 |  |  | 9,292 |
| $ | 16,392 |  |  | $ | 16,264 |
Realized gains and losses from the sale of securities are determined using the specific identification method. Gross gains realized on the sales of investment securities for the three and nine months ended December 30, 2017 were approximately $147,000 and $882,000, respectively. Gross losses realized were approximately $41,000 and $163,000 for the three and nine months ended December 30, 2017, respectively. Gross gains realized on the sales of investment securities for the three and nine months ended December 31, 2016 were approximately $386,000 and $1.0 million, respectively. Gross losses realized were approximately $46,000 and $303,000 for the three and nine months ended December 31, 2016, respectively.
Schedule of Investments [Table Text Block] | Investments consist of the following (in thousands):
| December 30, 2017 |  | April 1, 2017
Available-for-sale investment securities | $ | 30,487 |  |  | $ | 24,162 |
Non-marketable equity investments | 18,646 |  |  | 17,383 |
| $ | 49,133 |  |  | $ | 41,545 |
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):
| December 30, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 300 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 296 |
Residential mortgage-backed securities | 7,510 |  |  | 1 |  |  | (104 | ) |  | 7,407 |
State and political subdivision debt securities | 6,924 |  |  | 142 |  |  | (142 | ) |  | 6,924 |
Corporate debt securities | 1,658 |  |  | 2 |  |  | (23 | ) |  | 1,637 |
Marketable equity securities | 7,627 |  |  | 3,947 |  |  | (113 | ) |  | 11,461 |
Certificates of deposit | 2,762 |  |  | — |  |  | — |  |  | 2,762 |
| $ | 26,781 |  |  | $ | 4,092 |  |  | $ | (386 | ) |  | $ | 30,487 |
| April 1, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury and government debt securities | $ | 650 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 649 |
Residential mortgage-backed securities | 5,646 |  |  | 3 |  |  | (90 | ) |  | 5,559 |
State and political subdivision debt securities | 7,195 |  |  | 145 |  |  | (117 | ) |  | 7,223 |
Corporate debt securities | 1,698 |  |  | 4 |  |  | (23 | ) |  | 1,679 |
Marketable equity securities | 5,752 |  |  | 2,430 |  |  | (130 | ) |  | 8,052 |
Certificates of deposit | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
| $ | 21,941 |  |  | $ | 2,582 |  |  | $ | (361 | ) |  | $ | 24,162 |
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):
| December 30, 2017
| 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 | $ | 296 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | — |  |  | $ | 296 |  |  | $ | (4 | )
Residential mortgage-backed securities | 3,308 |  |  | (32 | ) |  | 3,860 |  |  | (72 | ) |  | 7,168 |  |  | (104 | )
State and political subdivision debt securities | 2,649 |  |  | (22 | ) |  | 2,309 |  |  | (120 | ) |  | 4,958 |  |  | (142 | )
Corporate debt securities | 1,012 |  |  | (8 | ) |  | 372 |  |  | (15 | ) |  | 1,384 |  |  | (23 | )
Marketable equity securities | 1,032 |  |  | (91 | ) |  | 104 |  |  | (22 | ) |  | 1,136 |  |  | (113 | )
| $ | 8,297 |  |  | $ | (157 | ) |  | $ | 6,645 |  |  | $ | (229 | ) |  | $ | 14,942 |  |  | $ | (386 | )
| April 1, 2017
| 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 | $ | 349 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 349 |  |  | $ | (1 | )
Residential mortgage-backed securities | 3,449 |  |  | (38 | ) |  | 1,962 |  |  | (52 | ) |  | 5,411 |  |  | (90 | )
State and political subdivision debt securities | 1,948 |  |  | (36 | ) |  | 2,084 |  |  | (81 | ) |  | 4,032 |  |  | (117 | )
Corporate debt securities | 1,424 |  |  | (23 | ) |  | — |  |  | — |  |  | 1,424 |  |  | (23 | )
Marketable equity securities | 1,393 |  |  | (90 | ) |  | 157 |  |  | (40 | ) |  | 1,550 |  |  | (130 | )
| $ | 8,563 |  |  | $ | (188 | ) |  | $ | 4,203 |  |  | $ | (173 | ) |  | $ | 12,766 |  |  | $ | (361 | )
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.
| December 30, 2017
| Amortized Cost |  | Fair Value
Due in less than one year | $ | 280 |  |  | $ | 279 |
Due after one year through five years | 4,223 |  |  | 4,157 |
Due after five years through ten years | 2,602 |  |  | 2,536 |
Due after ten years | 9,287 |  |  | 9,292 |
| $ | 16,392 |  |  | $ | 16,264 |

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