INVESTMENTS (Details) - USD ($)	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 7,037,000	$ 4,346,000
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(12,000)	(14,000)
Fair Value	7,025,000	4,332,000
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	56,907,000	45,958,000
Gross Unrecognized Gain	3,000	47,000
Gross Unrecognized (Loss)	(123,000)	(73,000)
Fair Value, Total investments	56,787,000	45,932,000
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Other-than-temporary impairment	0	0	$ 0
Unrealized losses on available-for-sale investments, net of related income taxes	(7,000)	(8,000)
Redemptions of investments with callable provisions	0	1,300,000	$ 600,000
Available-for-sale investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	4,314,000	0
Amortized Cost, Due in 1 to 4 years	2,723,000	4,346,000
Amortized Cost, Total investments	7,037,000	4,346,000
Available-for-sale investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	4,311,000	0
Fair Value, Due in 1 to 4 years	2,714,000	4,332,000
Fair Value, Total investments	7,025,000	4,332,000
Held-to-maturity investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	37,163,000	26,109,000
Amortized Cost, Due in 1 to 4 years	19,744,000	19,849,000
Amortized Cost, Total investments	56,907,000	45,958,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	37,128,000	26,151,000
Fair Value, Due in 1 to 4 years	19,659,000	19,781,000
Fair Value, Total investments	56,787,000	45,932,000
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,037,000	4,346,000
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(12,000)	(14,000)
Fair Value	7,025,000	4,332,000
Certificates of Deposit [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,737,000	6,717,000
Gross Unrecognized Gain	3,000	4,000
Gross Unrecognized (Loss)	0	(1,000)
Fair Value, Total investments	2,740,000	6,720,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	2,740,000	6,720,000
Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	12,455,000	13,484,000
Gross Unrecognized Gain	0	1,000
Gross Unrecognized (Loss)	(6,000)	0
Fair Value, Total investments	12,449,000	13,485,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	12,449,000	13,485,000
Corporate Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	41,715,000	22,773,000
Gross Unrecognized Gain	0	21,000
Gross Unrecognized (Loss)	(117,000)	(71,000)
Fair Value, Total investments	41,598,000	22,723,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	$ 41,598,000	22,723,000
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		2,984,000
Gross Unrecognized Gain		21,000
Gross Unrecognized (Loss)		(1,000)
Fair Value, Total investments		3,004,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments		$ 3,004,000