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STOCK PLANS AND STOCK-BASED COMPENSATION: Information related to stock options outstanding (Details) - 2017 Equity Incentive Plan - $ / shares	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Number of Shares
Balance, beginning of period	220,654	223,654
Options exercised	(23,022)	0
Expired	(15,000)	0
Balance, end of period	182,632	223,654
Weighted Average Exercise Price
Balance, beginning of period	$ 4.74	$ 4.73
Options exercised	4.43	0
Expired	14.49	0
Balance, end of period	$ 3.98	$ 4.73

X

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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