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Investments (Details 1) - USD ($) $ in Thousands | Dec. 29, 2018 | Mar. 31, 2018
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Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | $ 14,628 | $ 16,412
Gross Unrealized Gains | 105 | 110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (288) | (341)
Debt Securities, Available-for-sale | 14,445 | 16,181
U.S. Treasury and Government Agencies [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 300 | 300
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (7)
Debt Securities, Available-for-sale | 295 | 293
Mortgage-backed securities [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 7,417 | 7,654
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses | (155) | (155)
Debt Securities, Available-for-sale | 7,268 | 7,499
States and political subdivisions [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 5,270 | 6,377
Gross Unrealized Gains | 99 | 109
Gross Unrealized Losses | (79) | (149)
Debt Securities, Available-for-sale | 5,290 | 6,337
Corporate debt securities [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 1,641 | 2,081
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (49) | (30)
Debt Securities, Available-for-sale | $ 1,592 | $ 2,052

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