CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Cash flows from operating activities:
Net loss	$ (11,000)	$ (364,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock compensation cost amortized	54,000	54,000
Depreciation	169,000	149,000
Deferred income taxes		(226,000)
Changes in operating assets and liabilities:
Trade receivables	35,000	(115,000)
Inventories	(927,000)	(202,000)
Prepaid expenses and other assets	49,000	54,000
Trade accounts payable	549,000	(201,000)
Accrued liabilities	260,000	200,000
Contract assets and liabilities	(455,000)	(22,000)
Net cash provided (used) in operating activities	(277,000)	(673,000)
Cash flows from investing activities:
Capital expenditures	(81,000)	(51,000)
Net cash used in investing activities	(81,000)	(51,000)
Cash flows from financing activities:
Principal payments on long-term debt	(1,625,000)	(66,000)
Payments on capital lease obligations	(85,000)	(11,000)
Proceeds from long-term debt	815,000
Proceeds from line of credit	825,000	750,000
Net cash provided by (used in) financing activities	(70,000)	673,000
Net decrease in cash	(428,000)	(51,000)
Cash, beginning of period	575,000	298,000
Cash, end of period	147,000	247,000
Cash paid during the period for:
Interest	$ 44,626	25,000
Non-cash investing and financing activities:
Equipment financed with proceeds from capital lease		$ 225,000