CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Cash flows from operating activities:
Net earnings (loss)	$ (176,000)	$ 396,000
Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities:
Stock compensation cost amortized	33,000	(68,000)
Depreciation	194,000	311,000
Deferred income taxes	(118,000)	231,000
Increase (decrease) in cash flows from operations resulting from changes in:
Trade receivables	219,000	79,000
Inventories	(939,000)	(351,000)
Prepaid expenses and other assets	(75,000)	(74,000)
Trade accounts payable	140,000	(258,000)
Accrued liabilities	46,000	(204,000)
Customer deposits	(15,000)	(41,000)
Net cash provided by (used in) operating activities	(691,000)	21,000
Cash flows from investing activities:
Capital expenditures	(338,000)	(331,000)
Net cash used in investing activities	(338,000)	(331,000)
Cash flows from financing activities:
Principal payments on long-term debt	(66,000)	(101,000)
Proceeds from long-term debt	124,000
Net cash provided by (used in) financing activities	58,000	(101,000)
Net decrease in cash	(971,000)	(411,000)
Cash, beginning of period	1,846,000	1,892,000
Cash, end of period	875,000	1,481,000
Cash paid during the year for:
Interest	16,000	19,000
Income taxes	$ 87,000	$ 69,000