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Changes in Stockholders' Equity and Comprehensive Income (Loss)- Summary of Changes in stockholders' equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 75,435
Net income	$ 4,502	$ 2,732	10,259	$ 7,705
Net change in unrealized gain (loss) on short term investments	16	$ (1)	(19)	$ 7
Ending balance	79,244		79,244
Additional Paid-In Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			3,117
Share based compensation			$ 777
Dividends declared
Tax adjustment related to restricted stock			$ 93
Net income
Net change in unrealized gain (loss) on short term investments
Ending balance	3,987		$ 3,987
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 72,343
Share based compensation
Dividends declared			$ (7,301)
Tax adjustment related to restricted stock
Net income			$ 10,259
Net change in unrealized gain (loss) on short term investments
Ending balance	75,301		$ 75,301
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (54)
Share based compensation
Dividends declared
Tax adjustment related to restricted stock
Net income
Net change in unrealized gain (loss) on short term investments			$ (19)
Ending balance	$ (73)		$ (73)

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Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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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 change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

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

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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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