Changes in Stockholders' Equity and Comprehensive Income (Loss) - Summary of Changes in stockholders' equity (Details) (USD $) In Thousands, unless otherwise specified	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total
Beginning balance at Mar. 31, 2014	$ 1,578	$ 68,647	$ (37)	$ 70,217us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation	1,118
Dividends declared		(10,316)
Tax adjustment related to restricted stock	39
Net income		12,502		12,502us-gaap_NetIncomeLoss
Net change in unrealized gain (loss) on short term investments			(13)	(13)
Ending balance at Dec. 31, 2014	$ 2,735	$ 70,833	$ (50)	$ 73,547us-gaap_StockholdersEquity

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".

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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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- Definition

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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