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Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
REVENUES	$ 148,176,000	$ 136,431,000	$ 298,574,000	$ 274,043,000
Cost of revenues	116,686,000	110,679,000	235,731,000	219,508,000
Gross profit	31,490,000	25,752,000	62,843,000	54,535,000
General and administrative expenses	15,094,000	13,670,000	31,031,000	28,299,000
Income before income tax provision	16,396,000	12,082,000	31,812,000	26,236,000
Income tax provision	3,607,000	3,689,000	7,245,000	9,068,000
NET INCOME	$ 12,789,000	$ 8,393,000	$ 24,567,000	$ 17,168,000
Net income per common and common equivalent share
Basic	$ 0.68	$ 0.45	$ 1.30	$ 0.91
Diluted	$ 0.67	$ 0.44	$ 1.29	$ 0.90
Weighted average common and common equivalent shares
Basic	18,877,000	18,759,000	18,899,000	18,785,000
Diluted	19,089,000	18,966,000	19,095,000	18,983,000

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