Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
REVENUES	$ 140,734,000	$ 128,403,000	$ 414,777,000	$ 385,081,000
Cost of revenues	115,165,000	102,826,000	334,675,000	308,010,000
Gross profit	25,569,000	25,577,000	80,102,000	77,071,000
General and administrative expenses	15,496,000	14,134,000	43,794,000	42,239,000
Income before income tax provision	10,073,000	11,443,000	36,308,000	34,832,000
Income tax provision	504,000	4,394,000	9,571,000	13,340,000
NET INCOME	$ 9,569,000	$ 7,049,000	$ 26,737,000	$ 21,492,000
Net income per common and common equivalent share
Basic	$ 0.51	$ 0.36	$ 1.42	$ 1.10
Diluted	$ 0.50	$ 0.36	$ 1.41	$ 1.09
Weighted average common and common equivalent shares
Basic	18,849,000	19,426,000	18,806,000	19,526,000
Diluted	19,121,000	19,549,000	19,029,000	19,679,000