5. INCOME TAXES - Unrecognized tax benefits (Details) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Taxes
Unrecognized tax benefits, noncurrent	$ 116,000	$ 780,000
Deferred tax assets unrecognized tax benefit	1,943,000
Possible reduction in uncertain tax benefits	16,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of period	1,982,000	2,386,000	$ 2,760,000
Additions based on tax positions related to current year	453,000	292,000	250,000
Additions based on tax positions related to prior years	183,000		13,000
Lapses during the current year applicable to statutes of limitations	(563,000)	(696,000)	(637,000)
Unrecognized tax benefits, end of period	2,055,000	$ 1,982,000	$ 2,386,000
Unrecognized tax benefit that would impact effective tax rate	$ 112,000