Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
REVENUES	$ 128,403,000	$ 123,891,000	$ 385,081,000	$ 375,290,000
Cost of revenues	102,826,000	98,659,000	308,010,000	297,191,000
Gross profit	25,577,000	25,232,000	77,071,000	78,099,000
General and administrative expenses	14,134,000	14,501,000	42,239,000	42,672,000
Income before income tax provision	11,443,000	10,731,000	34,832,000	35,427,000
Income tax provision	4,394,000	4,040,000	13,340,000	13,568,000
NET INCOME	$ 7,049,000	$ 6,691,000	$ 21,492,000	$ 21,859,000
Net income per common and common equivalent share
Basic	$ 0.36	$ 0.34	$ 1.10	$ 1.10
Diluted	$ 0.36	$ 0.34	$ 1.09	$ 1.09
Weighted average common and common equivalent shares
Basic	19,426,000	19,673,000	19,526,000	19,908,000
Diluted	19,549,000	19,852,000	19,679,000	20,083,000