Consolidated Income Statements (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
CONSOLIDATED INCOME STATEMENTS [Abstract]
REVENUES	$ 105,458,000	$ 104,552,000	$ 210,064,000	$ 206,860,000
Cost of revenues	82,622,000	78,940,000	164,047,000	155,704,000
Gross profit	22,836,000	25,612,000	46,017,000	51,156,000
General and administrative expenses	11,981,000	12,592,000	24,155,000	24,886,000
Income before income tax provision	10,855,000	13,020,000	21,862,000	26,270,000
Income tax provision	4,225,000	5,139,000	8,636,000	10,191,000
NET INCOME	$ 6,630,000	$ 7,881,000	$ 13,226,000	$ 16,079,000
Net income per common and common equivalent share
Basic	$ 0.59	$ 0.68	$ 1.17	$ 1.39
Diluted	$ 0.58	$ 0.68	$ 1.16	$ 1.37
Weighted average common and common equivalent
Basic	11,270,000	11,526,000	11,292,000	11,572,000
Diluted	11,376,000	11,672,000	11,401,000	11,729,000