CONSOLIDATED STATEMENTS OF CASHFLOWS - USD ($)	3 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 444,000	$ (43,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock compensation cost amortized	27,000	27,000
Depreciation	92,000	84,000
Deferred income taxes		(15,000)
Changes in operating assets and liabilities:
Trade receivables	122,000	174,000
Contract assets	(69,000)	(233,000)
Inventories	(202,000)	(539,000)
Prepaid expenses and other assets	(199,000)	71,000
Operating lease right-of-use assets	(53,000)
Trade accounts payable	46,000	59,000
Accrued liabilities	511,000	218,000
Current and long-term operating lease liabilities	(53,000)
Customer deposits	2,000	(61,000)
Net cash used in operating activities	774,000	(258,000)
Cash flows from investing activities:
Capital expenditures	(116,000)	(50,000)
Net cash used in investing activities	(116,000)	(50,000)
Cash flows from financing activities:
Principal payments on long-term debt	(7,000)	(19,000)
Payments on capital lease obligations	(16,000)	(27,000)
Payments on line of credit	(3,777,000)
Proceeds from line of credit	3,437,000
Net cash provided by financing activities	(363,000)	(46,000)
Net increase (decrease) in cash	295,000	(354,000)
Cash, beginning of period	58,000	575,000
Cash, end of period	353,000	221,000
Cash paid during the period for:
Interest	27,000	$ 24,000
Capital leases reclassified from long-term debt to finance lease liabilities	98,000
Deferred lease reclassified from accrued liabilities to operating right-of-use assets	$ 206,000