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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, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Revenues	$ 169,451	$ 147,214	$ 149,118	$ 146,418	$ 152,917	$ 138,784	$ 150,210	$ 145,840	$ 612,201	$ 587,751	$ 567,906
Gross profit	61,168	53,215	54,804	53,068	56,451	49,427	55,173	54,171	222,255	215,222
Net income	10,169	13,379	5,969	6,992	5,242	2,836	5,018	7,109	36,509	20,205
Net income attributable to common stockholders	$ 10,159	$ 13,369	$ 5,959	$ 6,982	$ 5,232	$ 2,826	$ 5,008	$ 7,099	$ 36,469	$ 20,165	$ 11,556
Basic (in dollars per share)	$ 1.47	$ 1.88	$ 0.82	$ 0.92	$ 0.68	$ 0.36	$ 0.64	$ 0.89	$ 5.04	$ 2.57	$ 1.38
Diluted (in dollars per share)	$ 1.43	$ 1.82	$ 0.79	$ 0.90	$ 0.66	$ 0.35	$ 0.62	$ 0.87	$ 4.90	$ 2.49	$ 1.33

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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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