INVESTMENTS (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 7,980,000		$ 7,980,000		$ 8,253,000
Gross Unrealized Gain	79,000		79,000		41,000
Gross Unrealized (Loss)	0		0		0
Fair Value	8,059,000		8,059,000		8,294,000
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	38,423,000		38,423,000		36,837,000
Gross Unrecognized Gain	191,000		191,000		202,000
Gross Unrecognized (Loss)	(16,000)		(16,000)		(32,000)
Fair Value	38,598,000		38,598,000		37,007,000
Available-for-sale investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	946,000		946,000		670,000
Amortized Cost, Due in 1 to 4 years	7,034,000		7,034,000		7,583,000
Amortized Cost, Total investments	7,980,000		7,980,000		8,253,000
Available-for-sale investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	947,000		947,000		670,000
Fair Value, Due in 1 to 4 years	7,112,000		7,112,000		7,624,000
Fair Value, Total investments	8,059,000		8,059,000		8,294,000
Held-to-maturity investments by stated maturity, amortized cost [Abstract]
Amortized Cost, Due in less than one year	23,817,000		23,817,000		21,019,000
Amortized Cost, Due in 1 to 4 years	14,606,000		14,606,000		15,818,000
Amortized Cost, Total investments	38,423,000		38,423,000		36,837,000
Held-to-maturity investments by stated maturity, fair value [Abstract]
Fair Value, Due in less than one year	23,879,000		23,879,000		21,062,000
Fair Value, Due in 1 to 4 years	14,719,000		14,719,000		15,945,000
Fair Value, Total investments	38,598,000		38,598,000		37,007,000
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment			0		0
Unrealized gain (loss) on available-for-sale investments, net of related income taxes	47,000		47,000		25,000
Redemptions of investments	0	13,000,000	717,000	13,000,000
Certificates of deposit [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	3,590,000		3,590,000		844,000
Gross Unrecognized Gain	0		0		0
Gross Unrecognized (Loss)	(1,000)		(1,000)		0
Fair Value	3,589,000		3,589,000		844,000
Corporate bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	24,308,000		24,308,000		23,072,000
Gross Unrecognized Gain	142,000		142,000		131,000
Gross Unrecognized (Loss)	(15,000)		(15,000)		(31,000)
Fair Value	24,435,000		24,435,000		23,172,000
Municipal bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	10,525,000		10,525,000		12,921,000
Gross Unrecognized Gain	49,000		49,000		71,000
Gross Unrecognized (Loss)	0		0		(1,000)
Fair Value	10,574,000		10,574,000		12,991,000
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	996,000		996,000		1,245,000
Gross Unrealized Gain	5,000		5,000		2,000
Gross Unrealized (Loss)	0		0		0
Fair Value	1,001,000		1,001,000		1,247,000
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	6,038,000		6,038,000		6,047,000
Gross Unrealized Gain	73,000		73,000		38,000
Gross Unrealized (Loss)	0		0		0
Fair Value	6,111,000		6,111,000		6,085,000
Municipal bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	946,000		946,000		961,000
Gross Unrealized Gain	1,000		1,000		1,000
Gross Unrealized (Loss)	0		0		0
Fair Value	$ 947,000		$ 947,000		$ 962,000