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Investments (Tables)
 12 Months Ended
Mar. 28, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
Investments consisted of the following (in thousands):
 
March 28,
2020
 
March 30,
2019
Available-for-sale debt securities
$
14,774

 
$
13,408

Marketable equity securities
9,829

 
11,073

Non-marketable equity investments
21,536

 
20,276

 
$
46,139

 
$
44,757
Available-for-Sale Securities by Investment Category The following tables summarize the Company's available-for-sale debt securities, gross unrealized gains and losses and fair value, aggregated by investment category (in thousands):
 
March 28, 2020
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Residential mortgage-backed securities
$
5,400

 
$
69

 
$
(26
)
 
$
5,443

State and political subdivision debt securities
4,239

 
134

 
(3
)
 
4,370

Corporate debt securities
5,021

 
5

 
(65
)
 
4,961

 
$
14,660

 
$
208

 
$
(94
)
 
$
14,774


 
March 30, 2019
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Residential mortgage-backed securities
$
6,625

 
$
3

 
$
(119
)
 
$
6,509

State and political subdivision debt securities
4,883

 
117

 
(17
)
 
4,983

Corporate debt securities
1,635

 
3

 
(19
)
 
1,619

U.S. Treasury and government debt securities
300

 
—

 
(3
)
 
297

 
$
13,443

 
$
123

 
$
(158
)
 
$
13,408
Investment Securities in a Continuous Unrealized Loss Position
The following tables show gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities had been in a continuous unrealized loss position (in thousands):
 
March 28, 2020
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Residential mortgage-backed securities
$
133

 
$
—

 
$
1,779

 
$
(26
)
 
$
1,912

 
$
(26
)
State and political subdivision debt securities
601

 
(2
)
 
101

 
(1
)
 
702

 
(3
)
Corporate debt securities
3,747

 
(65
)
 
—

 
—

 
3,747

 
(65
)
 
$
4,481

 
$
(67
)
 
$
1,880

 
$
(27
)
 
$
6,361

 
$
(94
)

 
March 30, 2019
 
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Residential mortgage-backed securities
$
1,066

 
$
(9
)
 
$
5,206

 
$
(110
)
 
$
6,272

 
$
(119
)
State and political subdivision debt securities
353

 
—

 
2,319

 
(17
)
 
2,672

 
(17
)
Corporate debt securities
243

 
(8
)
 
1,073

 
(11
)
 
1,316

 
(19
)
U.S. Treasury and government debt securities
—

 
—

 
297

 
(3
)
 
297

 
(3
)
 
$
1,662

 
$
(17
)
 
$
8,895

 
$
(141
)
 
$
10,557

 
$
(158
)
Contractual Maturity of Investment Securities
The amortized cost and fair value of the Company's investments in available-for-sale 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 penalties.  
 
March 28, 2020
 
Amortized
Cost
 
Fair
Value
Due in less than one year
$
4,425

 
$
4,418

Due after one year through five years
2,379

 
2,338

Due after five years through ten years
775

 
831

Due after ten years
1,681

 
1,744

Mortgage-backed securities
5,400

 
5,443

 
$
14,660

 
$
14,774