INVESTMENTS (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 4,346,000	$ 10,890,000
Gross Unrealized Gain	0	33,000
Gross Unrealized (Loss)	(14,000)	(42,000)
Fair Value	4,332,000	10,881,000
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	45,958,000	36,712,000
Gross Unrecognized Gain	47,000	85,000
Gross Unrecognized (Loss)	(73,000)	(71,000)
Fair Value, Total investments	45,932,000	36,726,000
Available-for-sale Securities and Held-to-maturity Securities [Abstract]
Other-than-temporary impairment	0	0	0
Unrealized gain (loss) on available-for-sale investments, net of related income taxes	(8,000)	(5,000)
Redemptions of investments	1,300,000	600,000	1,300,000
Available-for-sale investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	0	6,509,000
Amortized Cost, Due in 1 to 4 years	4,346,000	4,381,000
Amortized Cost, Total investments	4,346,000	10,890,000
Available-for-sale investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	0	6,542,000
Fair Value, Due in 1 to 4 years	4,332,000	4,339,000
Fair Value, Total investments	4,332,000	10,881,000
Held-to-maturity investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	26,109,000	22,560,000
Amortized Cost, Due in 1 to 4 years	19,849,000	14,152,000
Amortized Cost, Total investments	45,958,000	36,712,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	26,151,000	22,571,000
Fair Value, Due in 1 to 4 years	19,781,000	14,155,000
Fair Value, Total investments	45,932,000	36,726,000
Certificates of Deposit [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	6,717,000	5,722,000
Gross Unrecognized Gain	4,000	0
Gross Unrecognized (Loss)	(1,000)	(8,000)
Fair Value, Total investments	6,720,000	5,714,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	6,720,000	5,714,000
Commercial Paper [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	13,484,000	12,991,000
Gross Unrecognized Gain	1,000	0
Gross Unrecognized (Loss)	0	(1,000)
Fair Value, Total investments	13,485,000	12,990,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	13,485,000	12,990,000
Corporate Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22,773,000	14,920,000
Gross Unrecognized Gain	21,000	65,000
Gross Unrecognized (Loss)	(71,000)	(33,000)
Fair Value, Total investments	22,723,000	14,952,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	22,723,000	14,952,000
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,984,000	3,079,000
Gross Unrecognized Gain	21,000	20,000
Gross Unrecognized (Loss)	(1,000)	(29,000)
Fair Value, Total investments	3,004,000	3,070,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Total investments	3,004,000	3,070,000
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		498,000
Gross Unrealized Gain		1,000
Gross Unrealized (Loss)		0
Fair Value		499,000
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,346,000	10,392,000
Gross Unrealized Gain	0	32,000
Gross Unrealized (Loss)	(14,000)	(42,000)
Fair Value	$ 4,332,000	$ 10,382,000