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Investments (Details 1) - USD ($) $ in Thousands | Sep. 29, 2018 | Mar. 31, 2018
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Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | $ 15,159 | $ 16,412
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 91 | 110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (350) | (341)
Debt Securities, Available-for-sale | 14,900 | 16,181
U.S. Treasury and Government Agencies [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 300 | 300
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | (10) | (7)
Debt Securities, Available-for-sale | 290 | 293
Mortgage-backed securities [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 7,714 | 7,654
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Gross Unrealized Losses | (207) | (155)
Debt Securities, Available-for-sale | 7,507 | 7,499
States and political subdivisions [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 5,499 | 6,377
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 90 | 109
Gross Unrealized Losses | (108) | (149)
Debt Securities, Available-for-sale | 5,481 | 6,337
Corporate debt securities [Member] |  |
Available-for-Sale Securities by Investment Category |  |
Debt Securities, Amortized Cost Basis | 1,646 | 2,081
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Gross Unrealized Losses | (25) | (30)
Debt Securities, Available-for-sale | $ 1,622 | $ 2,052

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