Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Cash flows from operating activities:
Net earnings (loss)	$ (131,000)	$ 625,000
Adjustments to reconcile net earnings (loss) to net cash used in operating activities:
Stock compensation earned	(111,000)	23,000
Depreciation	144,000	69,000
Change in value of stock appreciation rights	1,000	14,000
Increase (decrease) in cash flows from operations resulting from changes in:
Trade receivables	1,401,000	(405,000)
Inventories	53,000	(108,000)
Prepaid expenses and other assets	(35,000)	(26,000)
Trade accounts payable	(15,000)	312,000
Accrued liabilities	68,000	26,000
Customer deposits	(109,000)	(556,000)
Income taxes payable	(8,000)	0
Net cash provided by operating activities	1,258,000	(26,000)
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	(398,000)	(476,000)
Net cash used in investing activities	(398,000)	(476,000)
Cash flows from financing activities:
Proceeds from long-term debt	0	1,025,000
Principal payments on long-term debt	(51,000)	(592,000)
Payments on capital lease obligations	(17,000)	(15,000)
Net cash provided by (used in) financing activities	(68,000)	418,000
Net increase (decrease) in cash	792,000	(84,000)
Cash, beginning of period	490,000	1,030,000
Cash, end of period	1,282,000	946,000
Supplemental Disclosures of Cash Flow Information:
Cash paid during the period for interest	24,000	22,000
Cash paid during the period for income taxes	8,000	0
Non-cash investing and financing activities:
Capital expenditure	(41,000)	(42,000)
Proceeds from capital lease	$ 41,000	$ 42,000