CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flows from operating activities:
Net loss	$ (43,000)	$ (193,000)
Adjustments to reconcile net loss to net cash provided (used in) operating activities:
Stock compensation cost amortized	27,000	27,000
Depreciation	84,000	77,000
Deferred income taxes	(15,000)	(114,000)
Changes in operating assets and liabilities:
Trade receivables	174,000	361,000
Inventories	(539,000)	(237,000)
Prepaid expenses and other assets	71,000	34,000
Trade accounts payable	59,000	250,000
Accrued liabilities	218,000	247,000
Contract liabilities	(294,000)
Contract assets		2,000
Net cash provided (used) in operating activities	(258,000)	454,000
Cash flows from investing activities:
Capital expenditures	(50,000)	(7,000)
Net cash used in investing activities	(50,000)	(7,000)
Cash flows from financing activities:
Principal payments on long-term debt	(19,000)	(33,000)
Payments on capital lease obligations	(27,000)
Net cash used in financing activities	(46,000)	(33,000)
Net increase (decrease) in cash	(354,000)	414,000
Cash, beginning of period	575,000	298,000
Cash, end of period	221,000	712,000
Cash paid during the period for:
Interest	$ 24,000	$ 11,000