CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Cash flows from operating activities:
Net loss	$ (417,000)	$ (671,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock compensation cost amortized	81,000	81,000
Depreciation	253,000	233,000
Deferred income taxes		103,000
Changes in operating assets and liabilities:
Trade receivables	742,000	94,000
Contract assets	(901,000)
Inventories	(535,000)	(214,000)
Prepaid expenses and other assets	116,000	13,000
Trade accounts payable	412,000	(415,000)
Accrued liabilities	(147,000)	324,000
Customer deposits	(194,000)	(10,000)
Net cash provided (used) in operating activities	(590,000)	(462,000)
Cash flows from investing activities:
Capital expenditures	(108,000)	(52,000)
Net cash used in investing activities	(108,000)	(52,000)
Cash flows from financing activities:
Principal payments on long-term debt	(1,671,000)	(99,000)
Payments on capital lease obligations	(53,000)	(26,000)
Payments on line of credit	1,258,000
Proceeds from long-term debt	859,000
Proceeds from line of credit	2,286,000	750,000
Net cash provided by financing activities	163,000	625,000
Net increase (decrease) in cash	(535,000)	111,000
Cash, beginning of period	575,000	298,000
Cash, end of period	40,000	409,000
Cash paid during the period for:
Interest	$ 81,298	53,000
Non-cash investing and financing activities:
Equipment financed with proceeds from capital lease		$ 225,000