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Stockholders' Equity (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Nov. 06, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program Expiration Date | Dec. 31, 2016 |  |  |  |
Preferred stock shares authorized |  | 5,000,000.0 | 5,000,000.0 |  |
Preferred stock shares issued |  | 0 | 0 |  |
Preferred stock shares outstanding |  | 0 | 0 |  |
Annual maximum purchases authorized under stock buyback program |  | $ 25,000,000 |  |  |
Purchase of common stock on stock buyback program |  | 654,958 | 283,772 |  | 2,653,399
Payments for Repurchase of Common Stock |  | $ (10,461,000) | $ (5,000,000) | $ 0 |
Common stock shares withheld |  | 205,504 | 105,058 |  |
Treasury stock, shares |  | 1,591,072 | 1,447,394 |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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