Consolidated Income Statements - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
REVENUES	$ 123,891,000	$ 122,352,000	$ 375,290,000	$ 370,430,000
Cost of revenues	98,659,000	98,224,000	297,191,000	293,135,000
Gross profit	25,232,000	24,128,000	78,099,000	77,295,000
General and administrative expenses	14,501,000	13,834,000	42,672,000	40,789,000
Income before income tax provision	10,731,000	10,294,000	35,427,000	36,506,000
Income tax provision	4,040,000	3,462,000	13,568,000	13,492,000
NET INCOME	$ 6,691,000	$ 6,832,000	$ 21,859,000	$ 23,014,000
Net income per common and common equivalent share
Basic	$ 0.34	$ 0.33	$ 1.10	$ 1.11
Diluted	$ 0.34	$ 0.33	$ 1.09	$ 1.10
Weighted average common and common equivalent shares
Basic	19,673,000	20,599,000	19,908,000	20,784,000
Diluted	19,852,000	20,786,000	20,083,000	21,015,000