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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

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