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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Cash flows from operating activities:    
Net loss $ (10,026) $ (2,529)
Adjustments to reconcile net loss to net cash used in operating activities:    
Deferred income taxes 8 0
Depreciation and amortization 3,319 2,802
Deferred rent 0 65
Non-cash lease expense 214 0
Provision for losses on accounts receivable, inventories, other assets and warranty reserve 1,385 1,128
Loss (gain) on marketable securities 1 (3)
Loss on sale of fixed and other assets, net 143 18
Employee benefit plans expense 1,052 1,672
Stock-based compensation expense 312 500
Investment in Asia 0 (2,529)
Accounts receivable 1,970 (2,994)
Costs and estimated earnings in excess of billings (283) 509
Inventories 17 (199)
Prepaid expenses and other 878 (1,429)
Other assets (518) (468)
Accounts payable - trade 374 (195)
Accrued liabilities 947 73
Loss provision accrual 748 0
Income taxes refundable (350) 960
Other liabilities (1,598) (556)
Cash used in operating activities – continuing operations (1,407) (3,175)
Cash provided by operating activities – assets held for sale 0 3,078
Net cash (used in) provided by operating activities (1,407) (97)
Cash flows from investing activities:    
Purchase of marketable securities (5,489) (3,705)
Proceeds from sale or redemption of marketable securities 3,539 1,812
Capital expenditures (1,483) (2,767)
Net cash used in investing activities (3,433) (4,660)
Cash flows from financing activities:    
Proceeds from PPP loan 4,965 0
Net cash provided by financing activities 4,965 0
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes 125 (4,757)
Effect of exchange rate changes on cash and cash equivalents 0 606
Net increase (decrease) in cash and cash equivalents 125 (4,151)
Cash and cash equivalents at beginning of year 3,683 7,869
Cash and equivalents at end of year 3,808 3,718
Less cash and equivalents of assets held for sale at end of year 0 35
Cash and cash equivalents of continuing operations at end of year 3,808 3,683
Supplemental disclosures of cash flow information:    
Interest 99 83
Income taxes $ 0 $ 0