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EMPLOYEE BENEFIT PLANS: Activity related to options under all plans (Details) - $ / shares	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Number of Shares
Balance, beginning of year	141,365	220,654	223,654
Options exercised	(37,533)	(59,289)	(3,000)
Expired	(2,500)	(20,000)	0
Balance, end of year	101,332	141,365	220,654
Weighted Average Exercise Price
Balance, beginning of year	$ 3.77	$ 4.74	$ 4.73
Options exercised	4.84	4.13	3.84
Expired	8.12	13.42	0
Balance, end of year	$ 3.26	$ 3.77	$ 4.74

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
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- Definition

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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

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- Definition

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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