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6. FINANCIAL INSTRUMENTS - Available for sale investments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017
Available-for-sale investments |  |
Cost | $ 31,370,000 |
Fair Value | $ 31,316,000 |
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 | $ 19,000 | $ 17,000
Short-term investments |  |
Available-for-sale investments |  |
Cost | 17,236,000 | 16,202,000
Gross Unrealized Gains | 2,000 | 10,000
Gross Unrealized Losses | (18,000) | (13,000)
Fair Value | 17,220,000 | 16,199,000
Short-term investments | State and municipal obligations |  |
Available-for-sale investments |  |
Cost | 1,617,000 | 1,632,000
Gross Unrealized Gains |  | 1,000
Fair Value | 1,617,000 | 1,633,000
Short-term investments | Corporate notes |  |
Available-for-sale investments |  |
Cost | 556,000 | 557,000
Gross Unrealized Losses | (1,000) | (2,000)
Fair Value | 555,000 | 555,000
Short-term investments | Certificates of deposits |  |
Available-for-sale investments |  |
Cost | 10,000,000 | 10,000,000
Gross Unrealized Gains | 2,000 | 9,000
Gross Unrealized Losses | (6,000) | (3,000)
Fair Value | 9,996,000 | 10,006,000
Short-term investments | Foreign government obligations |  |
Available-for-sale investments |  |
Cost | 2,054,000 | 1,001,000
Gross Unrealized Losses | (4,000) | (1,000)
Fair Value | 2,050,000 | 1,000,000
Short-term investments | Agency bonds |  |
Available-for-sale investments |  |
Cost | 3,009,000 | 3,012,000
Gross Unrealized Losses | (7,000) | (7,000)
Fair Value | 3,002,000 | 3,005,000
Long-term investment |  |
Available-for-sale investments |  |
Cost | 14,134,000 | 12,942,000
Gross Unrealized Gains | 2,000 | 3,000
Gross Unrealized Losses | (40,000) | (47,000)
Fair Value | 14,096,000 | 12,898,000
Long-term investment | Certificates of deposits |  |
Available-for-sale investments |  |
Cost | 9,750,000 | 7,500,000
Gross Unrealized Gains | 2,000 | 3,000
Gross Unrealized Losses | (36,000) | (39,000)
Fair Value | 9,716,000 | 7,464,000
Long-term investment | Foreign government obligations |  |
Available-for-sale investments |  |
Cost | 4,384,000 | 5,442,000
Gross Unrealized Losses | (4,000) | (8,000)
Fair Value | $ 4,380,000 | $ 5,434,000

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