Condensed Consolidated Statements Of Cash Flows - USD ($)	6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Cash flows from operating activities
Net income	$ 1,815,104	$ 163,239
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	2,572,640	2,462,245
Stock-based compensation	415,628	42,805
Restricted stock expense	11,692	12,000
(Benefit from) provision for doubtful accounts	(86,844)	25,000
(Write-off) provision for inventory obsolescence	(59,396)
Deferred income tax benefit	(162,169)	(46,771)
Amortization of intangible assets	233,869	210,546
Loss from disposal or sale of machinery and equipment	9,459	5,141
Changes in assets and liabilities
Accounts receivable	(2,124,497)	(1,207,238)
Inventories	1,372,332	(5,359,581)
Prepaid expenses and other assets	271,248	(12,071)
Income taxes payable	466,919	(112,505)
Trade accounts payable	3,723,320	3,325,544
Deferred rent	(79,773)	30,306
Accrued expenses and wages	1,082,623	(526,384)
Net cash provided by (used in) operating activities	9,462,155	(987,724)
Cash flows from investing activities
Purchases of machinery and equipment	(1,037,065)	(2,317,007)
Net cash used in investing activities	(1,037,065)	(2,317,007)
Cash flows from financing activities
Proceeds from the exercise of common stock options	3,600	42,121
Proceeds from the sale of restricted stock	518,000
Proceeds from Employee stock purchases	34,338	84,453
Proceeds under sale leaseback agreements		1,102,317
Payments of contingent consideration	(141,577)	(65,000)
Payments under capital lease and sale leaseback agreements	(631,173)	(450,397)
Payments under building notes payable	(82,500)	(75,498)
Borrowings under lines of credit	101,633,930	77,978,706
Payments under lines of credit	(108,050,723)	(78,478,706)
Net cash (used in) provided by financing activities	(6,716,105)	137,996
Change in cash	1,708,985	(3,166,735)
Cash at beginning of period	2,868,217	5,440,319
Cash at end of period	4,577,202	2,273,584
Supplementary disclosures of cash flow information
Cash paid for interest	500,679	506,629
Cash paid for income taxes	591,211	756,678
Purchase of machinery and equipment financed under capital leases	703,229	1,326,086
Purchase of machinery and equipment financed under sale leaseback agreements		1,102,317
Financing of insurance policy	$ 302,857	$ 89,924