INVESTMENTS (Details) - USD ($)	Jun. 30, 2016	Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 6,025,000	$ 7,037,000
Gross Unrealized Gain	5,000	0
Gross Unrealized (Loss)	(2,000)	(12,000)
Fair Value	6,028,000	7,025,000
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	59,709,000	56,907,000
Gross Unrecognized Gain	9,000	3,000
Gross Unrecognized (Loss)	(88,000)	(123,000)
Fair Value, Total investments	59,630,000	56,787,000
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Unrealized gain (loss) on available-for-sale investments, net of related income taxes	2,000	(7,000)
Available-for-sale investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	5,020,000	4,314,000
Amortized Cost, Due in 1 to 4 years	1,005,000	2,723,000
Amortized Cost, Total investments	6,025,000	7,037,000
Available-for-sale investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	5,019,000	4,311,000
Fair Value, Due in 1 to 4 years	1,009,000	2,714,000
Fair Value, Total Investments	6,028,000	7,025,000
Held-to-maturity investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	43,638,000	37,163,000
Amortized Cost, Due in 1 to 4 years	16,071,000	19,744,000
Amortized Cost, Total investments	59,709,000	56,907,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	43,623,000	37,128,000
Fair Value, Due in 1 to 4 years	16,007,000	19,659,000
Fair Value, Total investments	59,630,000	56,787,000
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,025,000	7,037,000
Gross Unrealized Gain	5,000	0
Gross Unrealized (Loss)	(2,000)	(12,000)
Fair Value	6,028,000	7,025,000
Certificates of Deposit [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,737,000	2,737,000
Gross Unrecognized Gain	2,000	3,000
Gross Unrecognized (Loss)	0	0
Fair Value, Total investments	2,739,000	2,740,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	2,739,000	2,740,000
Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	16,453,000	12,455,000
Gross Unrecognized Gain	4,000	0
Gross Unrecognized (Loss)	(3,000)	(6,000)
Fair Value, Total investments	16,454,000	12,449,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	16,454,000	12,449,000
Corporate Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	40,519,000	41,715,000
Gross Unrecognized Gain	3,000	0
Gross Unrecognized (Loss)	(85,000)	(117,000)
Fair Value, Total investments	40,437,000	41,598,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	$ 40,437,000	$ 41,598,000