Consolidated Income Statements (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Consolidated Income Statements [Abstract]
REVENUES	$ 107,287,000	$ 101,381,000	$ 317,351,000	$ 308,241,000
Cost of revenues	85,553,000	80,155,000	249,600,000	235,859,000
Gross profit	21,734,000	21,226,000	67,751,000	72,382,000
General and administrative expenses	11,710,000	12,332,000	35,866,000	37,218,000
Income before income tax provision	10,024,000	8,894,000	31,885,000	35,164,000
Income tax provision	4,100,000	3,494,000	12,735,000	13,685,000
NET INCOME	$ 5,924,000	$ 5,400,000	$ 19,150,000	$ 21,479,000
Net income per common and common equivalent share
Basic	$ 0.53	$ 0.47	$ 1.70	$ 1.86
Diluted	$ 0.53	$ 0.47	$ 1.69	$ 1.84
Weighted average common and common equivalent shares
Basic	11,117,000	11,421,000	11,233,000	11,521,000
Diluted	11,213,000	11,574,000	11,338,000	11,677,000