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Note N - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Revenues	$ 154,749	$ 137,463	$ 133,004	$ 142,690	$ 137,611	$ 131,500	$ 133,834	$ 127,376	$ 567,906	$ 530,321
Gross profit	53,960	49,089	46,074	52,508	51,122	49,734	51,279	47,988	201,631	200,123
Net income	3,363	4,102	(485)	4,616	7,250	7,461	7,519	7,260	11,596	29,490
Net income attributable to common stockholders	$ 3,353	$ 4,092	$ (495)	$ 4,606	$ 7,240	$ 7,451	$ 7,509	$ 7,250	$ 11,556	$ 29,450	$ 21,089
Basic (in dollars per share)	$ 0.41	$ 0.49	$ (0.06)	$ 0.54	$ 0.85	$ 0.87	$ 0.87	$ 0.83	$ 1.38	$ 3.42	$ 2.36
Diluted (in dollars per share)	$ 0.40	$ 0.47	$ (0.06)	$ 0.52	$ 0.81	$ 0.82	$ 0.83	$ 0.79	$ 1.33	$ 3.25	$ 2.25

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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