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Changes in Shareholders' Equity and Comprehensive Income: (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance at March 31, 2016:			$ 83,195
Tax adjustment related to restricted stock			(115)	$ (92)
Net income	$ 4,823	$ 4,890	16,316	$ 15,149
Ending balance at December 31, 2016:	89,385		89,385
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance at March 31, 2016:			4,871
Share based compensation			1,444
Dividends declared
Tax adjustment related to restricted stock			115
Net income
Ending balance at December 31, 2016:	6,430		6,430
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance at March 31, 2016:			78,295
Share based compensation
Dividends declared			(11,686)
Tax adjustment related to restricted stock
Net income			16,316
Ending balance at December 31, 2016:	$ 82,925		$ 82,925

X

- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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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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No definition available.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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