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Note N - Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Gross profit	$ 56,451	$ 49,427	$ 55,173	$ 54,171	$ 53,960	$ 49,089	$ 46,074	$ 52,508	$ 215,222	$ 201,631
Net income	5,242	2,836	5,018	7,109	3,363	4,102	(485)	4,616	20,205	11,596
Net income attributable to common stockholders	$ 5,232	$ 2,826	$ 5,008	$ 7,099	$ 3,353	$ 4,092	$ (495)	$ 4,606	$ 20,165	$ 11,556	$ 29,450
Basic (in dollars per share)	$ 0.68	$ 0.36	$ 0.64	$ 0.89	$ 0.41	$ 0.49	$ (0.06)	$ 0.54	$ 2.57	$ 1.38	$ 3.42
Diluted (in dollars per share)	$ 0.66	$ 0.35	$ 0.62	$ 0.87	$ 0.40	$ 0.47	$ (0.06)	$ 0.52	$ 2.49	$ 1.33	$ 3.25
Revenues	$ 152,917	$ 138,784	$ 150,210	$ 145,840	$ 154,749	$ 137,463	$ 133,004	$ 142,690	$ 587,751	$ 567,906

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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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