Consolidated Income Statements - Unaudited - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
REVENUES	$ 141,506,000	$ 148,092,000	$ 407,134,000	$ 445,200,000
Cost of revenues	110,613,000	118,839,000	319,228,000	350,024,000
Gross profit	30,893,000	29,253,000	87,906,000	95,176,000
General and administrative expenses	16,937,000	17,000,000	48,084,000	49,290,000
Income before income tax provision	13,956,000	12,253,000	39,822,000	45,886,000
Income tax provision	2,576,000	2,901,000	8,275,000	10,256,000
NET INCOME	$ 11,380,000	$ 9,352,000	$ 31,547,000	$ 35,630,000
Net income per common and common equivalent share
Basic	$ 0.64	$ 0.51	$ 1.76	$ 1.94
Diluted	$ 0.63	$ 0.50	$ 1.74	$ 1.91
Weighted average common and common equivalent shares
Basic	17,899,000	18,253,000	17,939,000	18,410,000
Diluted	18,180,000	18,526,000	18,156,000	18,695,000