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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Operating activities: |  |
Net income | $ 4,150 | $ 945
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 980 | 993
Amortization | 119 | 118
Amortization of unrecognized prior service cost and actuarial losses | 437 | 525
Stock-based compensation expense | 534 | 149
Loss on disposal or sale of property, plant and equipment | 30 | 1
Deferred income taxes | 207 | 106
(Increase) decrease in operating assets: |  |
Accounts receivable | 2,656 | 151
Unbilled revenue | (5,276) | 3,186
Inventories | 3,652 | 846
Prepaid expenses and other current and non-current assets | (679) | (774)
Income taxes receivable | (303) | (1,507)
Prepaid pension asset | (576) | (478)
Increase (decrease) in operating liabilities: |  |
Accounts payable | (6,097) | (3,166)
Accrued compensation, accrued expenses and other current and non-current liabilities | 1,086 | (864)
Customer deposits | 4,096 | 560
Long-term portion of accrued compensation, accrued pension liability and accrued postretirement benefits | 59 | 57
Net cash provided by operating activities | 5,075 | 848
Investing activities: |  |
Purchase of property, plant and equipment | (367) | (431)
Proceeds from disposal of property, plant and equipment |  | 1
Purchase of investments | (64,611) | (25,000)
Redemption of investments at maturity | 45,023 | 18,000
Net cash used by investing activities | (19,955) | (7,430)
Financing activities: |  |
Principal repayments on capital lease obligations | (52) | (51)
Issuance of common stock | 171 |
Dividends paid | (1,868) | (1,758)
Purchase of treasury stock | (146) | (119)
Net cash used by financing activities | (1,895) | (1,928)
Effect of exchange rate changes on cash | (303) | 138
Net decrease in cash and cash equivalents | (17,078) | (8,372)
Cash and cash equivalents at beginning of year | 40,456 | 39,474
Cash and cash equivalents at end of period | $ 23,378 | $ 31,102

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