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5. FINANCIAL INSTRUMENTS (Details 2) (USD $)
 3 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Available-for-sale investments    
Cost $ 46,973,000  
Fair Value 46,982,000  
Other information    
Maximum maturity period of investment portfolio 3 years  
Deferred tax liability related to unrecognized gains and losses on short-term and long-term investments 0 11,000
Short-term Investments [Member]
    
Available-for-sale investments    
Cost 27,948,000 39,386,000
Gross Unrealized Gains 23,000 26,000
Fair Value 27,971,000 39,412,000
Short-term Investments [Member] | Municipal Bonds [Member]
    
Available-for-sale investments    
Cost 11,581,000 8,336,000
Gross Unrealized Gains 4,000 4,000
Fair Value 11,585,000 8,340,000
Short-term Investments [Member] | Corporate Note Securities [Member]
    
Available-for-sale investments    
Cost 7,366,000 5,023,000
Gross Unrealized Gains 12,000 12,000
Fair Value 7,378,000 5,035,000
Short-term Investments [Member] | Bonds [Member]
    
Available-for-sale investments    
Cost 1,001,000 3,523,000
Gross Unrealized Gains 1,000 2,000
Fair Value 1,002,000 3,525,000
Short-term Investments [Member] | Certificates of Deposit [Member]
    
Available-for-sale investments    
Cost 8,000,000 14,997,000
Gross Unrealized Gains 6,000 6,000
Fair Value 8,006,000 15,003,000
Short-term Investments [Member] | Other
    
Available-for-sale investments    
Cost   7,507,000
Gross Unrealized Gains   2,000
Fair Value   7,509,000
Other Long-term Investments [Member]
    
Available-for-sale investments    
Cost 19,025,000 28,800,000
Gross Unrealized Gains 14,000 26,000
Gross Unrealized Losses (28,000) (7,000)
Fair Value 19,011,000 28,819,000
Other Long-term Investments [Member] | Municipal Bonds [Member]
    
Available-for-sale investments    
Cost 1,074,000 8,227,000
Gross Unrealized Gains 5,000 10,000
Fair Value 1,079,000 8,237,000
Other Long-term Investments [Member] | Corporate Note Securities [Member]
    
Available-for-sale investments    
Cost 3,017,000 6,392,000
Gross Unrealized Gains 9,000 16,000
Fair Value 3,026,000 6,408,000
Other Long-term Investments [Member] | Bonds [Member]
    
Available-for-sale investments    
Cost 3,008,000 2,011,000
Gross Unrealized Losses (9,000) (5,000)
Fair Value 2,999,000 2,006,000
Other Long-term Investments [Member] | Certificates of Deposit [Member]
    
Available-for-sale investments    
Cost 10,250,000 10,500,000
Gross Unrealized Losses (12,000) (2,000)
Fair Value 10,238,000 10,498,000
Other Long-term Investments [Member] | Other Debt Obligations [Member]
    
Available-for-sale investments    
Cost 1,676,000 1,670,000
Gross Unrealized Losses (7,000)  
Fair Value $ 1,669,000 $ 1,670,000