CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities:
Net earnings	$ 125,000	$ 61,000
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Stock compensation cost amortized		8,000
Depreciation	63,000	93,000
Deferred income taxes	86,000	46,000
Increase (decrease) in cash flows from operations resulting from changes in:
Trade receivables	(86,000)	(216,000)
Inventories	(236,000)	(212,000)
Prepaid expenses and other assets	(37,000)	(55,000)
Trade accounts payable	89,000	124,000
Accrued liabilities	111,000	(111,000)
Customer deposits	(19,000)	19,000
Net cash provided by (used in) operating activities	96,000	(243,000)
Cash flows from investing activities:
Capital expenditures	(187,000)	(178,000)
Net cash used in investing activities	(187,000)	(178,000)
Cash flows from financing activities:
Principal payments on long-term debt	(22,000)	(44,000)
Net cash used in financing activities	(22,000)	(44,000)
Net decrease in cash	(113,000)	(465,000)
Cash, beginning of period	1,846,000	1,892,000
Cash, end of period	1,733,000	1,427,000
Cash paid during the year for:
Interest	6,000	6,000
Income taxes	$ 19,150	$ 22,000