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Investments (Tables)
 3 Months Ended
Jun. 28, 2014
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):
 
June 28,
2014
 
March 29,
2014
Available-for-sale investment securities
$
20,141

 
$
19,802

Non-marketable equity investments
5,473

 
5,652

 
$
25,614

 
$
25,454


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):
 
June 28, 2014
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury and government debt securities
$
2,163

 
$
1

 
$
(21
)
 
$
2,143

Residential mortgage-backed securities
3,065

 
14

 
(75
)
 
3,004

State and political subdivision debt securities
6,143

 
224

 
(11
)
 
6,356

Corporate debt securities
2,866

 
17

 
(1
)
 
2,882

Marketable equity securities
3,923

 
844

 
(61
)
 
4,706

Certificates of deposit
1,050

 
—

 
—

 
1,050

 
$
19,210

 
$
1,100

 
$
(169
)
 
$
20,141


 
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


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):
 
June 28, 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
$
445

 
$
(4
)
 
$
686

 
$
(17
)
 
$
1,131

 
$
(21
)
Residential mortgage-backed securities
1,267

 
(64
)
 
988

 
(11
)
 
2,255

 
(75
)
State and political subdivision debt securities
259

 
(5
)
 
249

 
(6
)
 
508

 
(11
)
Corporate debt securities
1,028

 
(1
)
 
—

 
—

 
1,028

 
(1
)
Marketable equity securities
608

 
(61
)
 
—

 
—

 
608

 
(61
)
 
$
3,607

 
$
(135
)
 
$
1,923

 
$
(34
)
 
$
5,530

 
$
(169
)

 
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
)

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 June 28, 2014.
As of June 28, 2014, the Company's investments in marketable equity securities consist of investments in common stock of industrial and other companies ($4.3 million of the total fair value and $53,000 of the total unrealized losses) and bank trust, insurance and public utility companies ($393,000 of the total fair value and $8,000 of the total unrealized losses).
As of March 29, 2014, the Company's investments in marketable equity securities consisted of investments in common stock of industrial and other companies ($4.7 million of the total fair value and $64,000 of the total unrealized losses) and bank trust, insurance and public utility companies ($478,000 of the total fair value and $9,000 of the total unrealized losses).
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 will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
June 28, 2014
 
March 29, 2014
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Due in less than one year
$
3,224

 
$
3,241

 
$
2,006

 
$
2,017

Due after one year through five years
2,834

 
2,862

 
2,908

 
2,949

Due after five years through ten years
1,589

 
1,578

 
924

 
872

Due after ten years
6,590

 
6,704

 
7,707

 
7,692

 
$
14,237

 
$
14,385

 
$
13,545

 
$
13,530


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 months ended June 28, 2014 and June 29, 2013 were approximately $303,000 and $68,000, respectively. Gross losses realized were approximately $68,000 and $36,000 for the three months ended June 28, 2014 and June 29, 2013, respectively.
Schedule of Investments [Table Text Block]
Investments consist of the following (in thousands):
 
June 28,
2014
 
March 29,
2014
Available-for-sale investment securities
$
20,141

 
$
19,802

Non-marketable equity investments
5,473

 
5,652

 
$
25,614

 
$
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):
 
June 28, 2014
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury and government debt securities
$
2,163

 
$
1

 
$
(21
)
 
$
2,143

Residential mortgage-backed securities
3,065

 
14

 
(75
)
 
3,004

State and political subdivision debt securities
6,143

 
224

 
(11
)
 
6,356

Corporate debt securities
2,866

 
17

 
(1
)
 
2,882

Marketable equity securities
3,923

 
844

 
(61
)
 
4,706

Certificates of deposit
1,050

 
—

 
—

 
1,050

 
$
19,210

 
$
1,100

 
$
(169
)
 
$
20,141


 
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):
 
June 28, 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
$
445

 
$
(4
)
 
$
686

 
$
(17
)
 
$
1,131

 
$
(21
)
Residential mortgage-backed securities
1,267

 
(64
)
 
988

 
(11
)
 
2,255

 
(75
)
State and political subdivision debt securities
259

 
(5
)
 
249

 
(6
)
 
508

 
(11
)
Corporate debt securities
1,028

 
(1
)
 
—

 
—

 
1,028

 
(1
)
Marketable equity securities
608

 
(61
)
 
—

 
—

 
608

 
(61
)
 
$
3,607

 
$
(135
)
 
$
1,923

 
$
(34
)
 
$
5,530

 
$
(169
)

 
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 will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
 
June 28, 2014
 
March 29, 2014
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Due in less than one year
$
3,224

 
$
3,241

 
$
2,006

 
$
2,017

Due after one year through five years
2,834

 
2,862

 
2,908

 
2,949

Due after five years through ten years
1,589

 
1,578

 
924

 
872

Due after ten years
6,590

 
6,704

 
7,707

 
7,692

 
$
14,237

 
$
14,385

 
$
13,545

 
$
13,530