Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
REVENUES	$ 150,398,000	$ 137,612,000
Cost of revenues	119,045,000	108,829,000
Gross profit	31,353,000	28,783,000
General and administrative expenses	15,937,000	14,629,000
Income before income tax provision	15,416,000	14,154,000
Income tax provision	3,638,000	5,379,000
NET INCOME	$ 11,778,000	$ 8,775,000
Net income per common and common equivalent share
Basic	$ 0.62	$ 0.47
Diluted	$ 0.62	$ 0.46
Weighted average common and common equivalent shares
Basic	18,922,000	18,811,000
Diluted	19,102,000	19,000,000