Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
REVENUES	$ 150,139,000	$ 150,398,000
Cost of revenues	117,005,000	119,045,000
Gross profit	33,134,000	31,353,000
General and administrative expenses	15,752,000	15,937,000
Income before income tax provision	17,382,000	15,416,000
Income tax provision	3,975,000	3,638,000
NET INCOME	$ 13,407,000	$ 11,778,000
Net income per common and common equivalent share
Basic	$ 0.72	$ 0.62
Diluted	$ 0.71	$ 0.62
Weighted average common and common equivalent shares
Basic	18,524,000	18,922,000
Diluted	18,787,000	19,102,000