Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities:
Net loss	$ (926,942)	$ (117,255)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of deferred gain on sale leaseback	(17,916)	(17,916)
Depreciation and amortization	24,050	24,000
Bad debt expense		2,078
Stock-based compensation expense	429,000	212,834
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	1,129,022	(504,137)
Decrease in inventories	66,487	223,581
Increase in other current assets	(93,510)	(13,888)
Increase in other assets	(4,672)
Increase (decrease) in accounts payable	234,556	(265,336)
Decrease in accrued and other liabilities	(20,548)	(55,060)
Net cash provided by (used in) operating activities	819,527	(511,099)
Cash flows from financing activities:
Net borrowings (repayments) under revolving credit line	(727,113)	254,136
Repayment of convertible notes		(27,500)
Proceeds from sale of common shares		500,000
Net cash provided by (used in) financing activities	(727,113)	726,636
Net increase in cash	92,414	215,537
Cash at beginning of period	56,262	327,298
Cash at end of period	148,676	542,835
Cash paid during the period for:
Interest	38,793	62,644
Supplemental disclosures of non-cash flow information:
Conversion of series B preferred stock into common stock	$ 3,414,621
Non-cash preferred stock dividends		$ 62,600