CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Cash flows from operating activities:
Net earnings (loss)	$ 15,000	$ 295,000
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Stock compensation cost amortized	11,000	17,000
Depreciation	130,000	189,000
Deferred income taxes	12,000	165,000
Increase (decrease) in cash flows from operations resulting from changes in:
Trade receivables	560,000	(220,000)
Inventories	(525,000)	(253,000)
Prepaid expenses and other assets	(88,000)	(32,000)
Trade accounts payable	28,000	(74,000)
Accrued liabilities	(240,000)	(255,000)
Customer deposits	(11,000)	(13,000)
Net cash used in operating activities	(108,000)	(181,000)
Cash flows from investing activities:
Capital expenditures	(275,000)	(279,000)
Net cash used in investing activities	(275,000)	(279,000)
Cash flows from financing activities:
Principal payments on long-term debt	(44,000)	(79,000)
Net cash used in financing activities	(44,000)	(79,000)
Net decrease in cash	(427,000)	(539,000)
Cash, beginning of period	1,846,000	1,892,000
Cash, end of period	1,419,000	1,353,000
Cash paid during the year for:
Interest	11,000	13,000
Income taxes	$ 87,000	$ 39,000