Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
REVENUES	$ 157,743,000	$ 136,028,000	$ 310,363,000	$ 265,628,000
Cost of revenues	121,082,000	105,525,000	236,489,000	208,616,000
Gross profit	36,661,000	30,503,000	73,874,000	57,012,000
General and administrative expenses	16,658,000	15,560,000	33,303,000	31,145,000
Income before income tax provision	20,003,000	14,943,000	40,571,000	25,867,000
Income tax provision	3,931,000	3,078,000	7,656,000	5,700,000
NET INCOME	$ 16,072,000	$ 11,865,000	$ 32,915,000	$ 20,167,000
Net income per common and common equivalent share
Basic	$ 0.90	$ 0.66	$ 1.84	$ 1.12
Diluted	$ 0.88	$ 0.65	$ 1.81	$ 1.11
Weighted average common and common equivalent shares
Basic	17,841,000	17,937,000	17,869,000	17,960,000
Diluted	18,232,000	18,174,000	18,226,000	18,144,000