Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities:
Net loss from continuing operations	$ (2,529)	$ (22,451)
Net loss from discontinued operations	0	(1,326)
Net loss	(2,529)	(23,777)
Adjustments to reconcile net loss to net cash provided by operating activities:
Deferred income taxes	0	9,638
Depreciation and amortization	2,802	2,484
Deferred lease obligation and other liabilities	65	(192)
Provision for losses on accounts receivable, inventories and warranty reserve	1,128	5,350
Gains on marketable securities	(3)	(1,047)
Loss on sale of fixed and other assets, net	18	77
Employee benefit plans expense	1,672	1,294
Stock-based compensation expense	500	470
Investment in Asia	(2,529)	0
Loss on sale of Gillam	0	359
Changes in operating assets and liabilities:
Accounts receivable	(2,994)	5,898
Costs and estimated earnings in excess of billings	509	2,970
Inventories	(199)	(2,105)
Prepaid expenses and other	(1,429)	61
Other assets	(468)	(1,555)
Accounts payable - trade	(195)	379
Accrued liabilities	73	235
Income taxes refundable	960	3,311
Other liabilities	(556)	(559)
Cash (used in) provided by operating activities – continuing operations	(3,175)	3,291
Cash provided by operating activities – assets held for sale	3,078	0
Cash provided by operating activities – discontinued operations	0	1,242
Net cash (used in) provided by operating activities	(97)	4,533
Cash flows from investing activities:
Proceeds from sale of Gillam	0	188
Purchase of marketable securities	(3,705)	(4,961)
Proceeds from sale or redemption of marketable securities	1,812	6,477
Capital expenditures	(2,767)	(1,418)
Cash (used in) provided by investing activities – continuing operations	(4,660)	286
Cash provided by investing activities – discontinued operations	0	55
Net cash (used in) provided by investing activities	(4,660)	341
Net (decrease) increase in cash and cash equivalents before effect of exchange rate changes	(4,757)	4,874
Effect of exchange rate changes on cash and cash equivalents	606	257
Net (decrease) increase in cash and cash equivalents	(4,151)	5,131
Cash and cash equivalents at beginning of year	7,869	2,738
Cash and equivalents at end of year	3,718	7,869
Less cash and equivalents of assets held for sale at end of year	35	0
Cash and cash equivalents of continuing operations at end of year	3,683	7,869
Supplemental disclosures of cash flow information:
Interest	83	79
Income taxes	0	325
Non-cash activities:
Note receivable on sale of Gillam	$ 0	$ 1,000