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6. FINANCIAL INSTRUMENTS - Available for sale investments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016
Available-for-sale investments |  |
Cost | $ 29,144,000 |
Fair Value | $ 29,097,000 |
Other information |  |
Maximum maturity period of investment portfolio | 3 years |
Deferred tax asset related to unrecognized gains and losses on short-term and long-term investments | $ 17,000 |
Deferred tax liability related to unrecognized gains and losses on short-term and long-term investments |  | $ 14,000
Short-term investments |  |
Available-for-sale investments |  |
Cost | 16,202,000 | 23,137,000
Gross Unrealized Gains | 10,000 | 16,000
Gross Unrealized Losses | (13,000) | (4,000)
Fair Value | 16,199,000 | 23,149,000
Short-term investments | State and municipal obligations |  |
Available-for-sale investments |  |
Cost | 1,632,000 | 1,011,000
Gross Unrealized Gains | 1,000 |
Fair Value | 1,633,000 | 1,011,000
Short-term investments | Corporate notes |  |
Available-for-sale investments |  |
Cost | 557,000 | 5,680,000
Gross Unrealized Losses | (2,000) | (4,000)
Fair Value | 555,000 | 5,676,000
Short-term investments | Certificates of deposits |  |
Available-for-sale investments |  |
Cost | 10,000,000 | 11,750,000
Gross Unrealized Gains | 9,000 | 12,000
Gross Unrealized Losses | (3,000) |
Fair Value | 10,006,000 | 11,762,000
Short-term investments | Foreign government obligations |  |
Available-for-sale investments |  |
Cost | 1,001,000 | 2,695,000
Gross Unrealized Gains |  | 3,000
Gross Unrealized Losses | (1,000) |
Fair Value | 1,000,000 | 2,698,000
Short-term investments | Agency bonds |  |
Available-for-sale investments |  |
Cost | 3,012,000 | 2,001,000
Gross Unrealized Gains |  | 1,000
Gross Unrealized Losses | (7,000) |
Fair Value | 3,005,000 | 2,002,000
Long-term investment |  |
Available-for-sale investments |  |
Cost | 12,942,000 | 11,118,000
Gross Unrealized Gains | 3,000 | 30,000
Gross Unrealized Losses | (47,000) | (1,000)
Fair Value | 12,898,000 | 11,147,000
Long-term investment | Corporate notes |  |
Available-for-sale investments |  |
Cost |  | 558,000
Gross Unrealized Gains |  | 1,000
Fair Value |  | 559,000
Long-term investment | Certificates of deposits |  |
Available-for-sale investments |  |
Cost | 7,500,000 | 8,500,000
Gross Unrealized Gains | 3,000 | 24,000
Gross Unrealized Losses | (39,000) | (1,000)
Fair Value | 7,464,000 | 8,523,000
Long-term investment | Foreign government obligations |  |
Available-for-sale investments |  |
Cost | 5,442,000 | 1,060,000
Gross Unrealized Gains |  | 1,000
Gross Unrealized Losses | (8,000) |
Fair Value | $ 5,434,000 | 1,061,000
Long-term investment | Agency bonds |  |
Available-for-sale investments |  |
Cost |  | 1,000,000
Gross Unrealized Gains |  | 4,000
Fair Value |  | $ 1,004,000

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