INCOME TAXES, Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Deferred tax assets [Abstract]
Accrued vacation	$ 2,391	$ 2,537
Deferred revenue	5,090	4,227
Allowance for credit losses	951	1,048
Restricted stock	616	772
Other deferred tax assets	743	1,552
Accrued bonus	2,532	2,277
Lease liabilities	1,857	2,476
Other credits and carryforwards	249	0
Gross deferred tax assets	14,429	14,889
Less: valuation allowance	(250)	0
Net deferred tax assets	14,179	14,889
Deferred tax liabilities [Abstract]
Property and equipment	(2,295)	(2,391)
Operating leases	(2,759)	(6,948)
Prepaid expenses	(887)	(912)
Right-of-use assets	(1,869)	(2,419)
Tax deductible goodwill	(1,319)	(751)
Total deferred tax liabilities	(9,129)	(13,421)
Net deferred tax asset	$ 5,050	$ 1,468