Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Cash flows from operating activities:
Net earnings (loss)	$ (101,000)	$ 159,000
Adjustments to reconcile net earnings (loss) to net cash used in operating activities:
Stock compensation earned	(109,000)	20,000
Depreciation	226,000	133,000
Change in value of stock appreciation rights	(5,000)	97,000
Increase (decrease) in cash flows from operations resulting from changes in:
Trade receivables	1,251,000	88,000
Inventories	139,000	(301,000)
Prepaid expenses and other assets	(41,000)	(52,000)
Trade accounts payable	(77,000)	181,000
Accrued liabilities	(22,000)	(35,000)
Customer deposits	(472,000)	233,000
Income taxes payable	(8,000)	0
Net cash provided by operating activities	781,000	523,000
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	(421,000)	(541,000)
Net cash used in investing activities	(421,000)	(541,000)
Cash flows from financing activities:
Proceeds from long-term debt	0	1,025,000
Principal payments on long-term debt	(77,000)	(618,000)
Payments on capital lease obligations	(24,000)	(19,000)
Net cash provided by (used in) financing activities	(101,000)	388,000
Net increase (decrease) in cash	259,000	370,000
Cash, beginning of period	490,000	1,030,000
Cash, end of period	749,000	1,400,000
Supplemental Disclosures of Cash Flow Information:
Cash paid during the period for interest	36,000	34,000
Cash paid during the period for income taxes	8,000	0
Non-cash investing and financing activities:
Capital expenditure	(41,000)	(50,000)
Proceeds from capital lease	$ 41,000	$ 50,000