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6. FINANCIAL INSTRUMENTS - Available for sale investments (Details) - USD ($)	9 Months Ended
	Dec. 31, 2016	Mar. 31, 2016
Available-for-sale investments
Cost	$ 30,666,000
Fair Value	$ 30,632,000
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	$ 12,000
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	16,502,000	23,137,000
Gross Unrealized Gains	13,000	16,000
Gross Unrealized Losses	(5,000)	(3,000)
Fair Value	16,510,000	23,150,000
Short-term investments | State and municipal obligations
Available-for-sale investments
Cost		1,011,000
Fair Value		1,011,000
Short-term investments | Corporate notes
Available-for-sale investments
Cost	2,251,000	5,680,000
Gross Unrealized Gains	1,000
Gross Unrealized Losses		(3,000)
Fair Value	2,252,000	5,677,000
Short-term investments | Certificates of deposits
Available-for-sale investments
Cost	12,250,000	11,750,000
Gross Unrealized Gains	11,000	12,000
Gross Unrealized Losses	(3,000)
Fair Value	12,258,000	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	(2,000)
Fair Value	999,000	2,698,000
Short-term investments | Agency bonds
Available-for-sale investments
Cost	1,000,000	2,001,000
Gross Unrealized Gains	1,000	1,000
Fair Value	1,001,000	2,002,000
Long-term investment
Available-for-sale investments
Cost	14,164,000	11,118,000
Gross Unrealized Gains	8,000	30,000
Gross Unrealized Losses	(50,000)	(1,000)
Fair Value	14,122,000	11,147,000
Long-term investment | State and municipal obligations
Available-for-sale investments
Cost	1,648,000
Gross Unrealized Losses	(1,000)
Fair Value	1,647,000
Long-term investment | Corporate notes
Available-for-sale investments
Cost	557,000	558,000
Gross Unrealized Gains		1,000
Gross Unrealized Losses	(2,000)
Fair Value	555,000	559,000
Long-term investment | Certificates of deposits
Available-for-sale investments
Cost	6,500,000	8,500,000
Gross Unrealized Gains	8,000	24,000
Gross Unrealized Losses	(29,000)	(1,000)
Fair Value	6,479,000	8,523,000
Long-term investment | Foreign government obligations
Available-for-sale investments
Cost	3,445,000	1,060,000
Gross Unrealized Gains		1,000
Gross Unrealized Losses	(10,000)
Fair Value	3,435,000	1,061,000
Long-term investment | Agency bonds
Available-for-sale investments
Cost	2,014,000	1,000,000
Gross Unrealized Gains		4,000
Gross Unrealized Losses	(8,000)
Fair Value	$ 2,006,000	$ 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)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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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-Topic 320
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-Section 50
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