Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Cash flows from operating activities
Net income	$ 1,134,324	$ 1,978,034
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	4,069,944	4,440,426
Stock-based compensation	2,414	9,657
Provision for doubtful accounts	14,103	6,600
Provision for inventory obsolescence	36,352
Deferred income tax expense	337,580	533,534
Amortization of customer relationships	112,750	163,996
Loss from disposal or sale of machinery and equipment	52,855	8,637
Changes in assets and liabilities
Accounts receivable	(4,381,326)	1,374,307
Inventories	7,147,110	(7,615,784)
Prepaid expenses and other assets	(114,311)	80,333
Refundable income taxes	(38,141)	(427,512)
Trade accounts payable	1,402,892	(241,294)
Deferred rent	13,057	722,559
Accrued expenses and payroll	18,707	70,057
Income taxes payable		(1,288,617)
Net cash provided by (used in) operating activities	9,808,310	(185,067)
Cash flows from investing activities
Purchases of machinery and equipment	(2,307,143)	(4,920,081)
Net cash used in investing activities	(2,307,143)	(4,920,081)
Cash flows from financing activities
Proceeds from exercise of common stock options	99,656	92,679
Payments under capital lease obligations	(850,104)	(943,711)
Proceeds under sale lease back agreement		835,330
Payments under other notes payable	(160,994)	(160,994)
Payments under building notes payable	(99,996)	(99,996)
Net (payments) proceeds under lines of credit	(6,000,000)	6,874,942
Change in bank overdraft		(1,407,572)
Tax benefit from exercise of options	41,100
Net cash (used in) provided by financing activities	(6,970,338)	5,190,678
INCREASE IN CASH	530,829	85,530
Cash and cash equivalents at beginning of year	4,138,102	4,052,572
Cash and cash equivalents at end of year	4,668,931	4,138,102
Supplementary disclosures of cash flow information
Cash paid for interest	968,478	1,011,517
Cash paid for income taxes, net of (refunds)	(93,287)	1,990,756
Purchase of machinery and equipment financed under capital leases		$ 541,468