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Investments (Tables)
 12 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
Investments consist of the following (in thousands):
 
March 31,
2018
 
April 1,
2017
Available-for-sale investment securities
$
26,586

 
$
24,162

Non-marketable equity investments
18,853

 
17,383

 
$
45,439

 
$
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):
 
March 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
U.S. Treasury and government debt securities
$
300

 
$
—

 
$
(7
)
 
$
293

Residential mortgage-backed securities
7,654

 
—

 
(155
)
 
7,499

State and political subdivision debt securities
6,377

 
109

 
(149
)
 
6,337

Corporate debt securities
2,081

 
1

 
(30
)
 
2,052

Marketable equity securities
6,533

 
2,435

 
(273
)
 
8,695

Certificates of deposit
1,710

 
—

 
—

 
1,710

 
$
24,655

 
$
2,545

 
$
(614
)
 
$
26,586


 
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):
 
March 31, 2018
 
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
$
293

 
$
(7
)
 
$
—

 
$
—

 
$
293

 
$
(7
)
Residential mortgage-backed securities
3,185

 
(52
)
 
3,909

 
(103
)
 
7,094

 
(155
)
State and political subdivision debt securities
2,224

 
(40
)
 
2,180

 
(109
)
 
4,404

 
(149
)
Corporate debt securities
1,384

 
(12
)
 
367

 
(18
)
 
1,751

 
(30
)
Marketable equity securities
2,550

 
(268
)
 
15

 
(5
)
 
2,565

 
(273
)
 
$
9,636

 
$
(379
)
 
$
6,471

 
$
(235
)
 
$
16,107

 
$
(614
)

 
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.
 
 
March 31, 2018
 
Amortized
Cost
 
Fair
Value
Due in less than one year
$
1,005

 
$
990

Due after one year through five years
3,140

 
3,056

Due after five years through ten years
1,228

 
1,197

Due after ten years
3,385

 
3,439

Mortgage-backed securities
7,654

 
7,499

 
$
16,412

 
$
16,181