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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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