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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Class of Stock [Line Items] |
Schedule of Repurchase Agreements [Table Text Block] | Monthly stock repurchases for the periods presented, all of which were purchased as part of a publicly announced plan or program, were as follows:
| Total Number of Shares Purchased | Average Price paid per Share | Approximate Dollar Value of Shares that May Yet be Purchased under the Program | Plan Expiration
May 1, 2018- May 30, 2018 | 1,190,420 |  | $ | 3.89 |  | $ | 15,366,000 |  | February 28, 2019
Totals for 2018 | 1,190,420 |  | $ | 3.89 |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The entire disclosure for repurchase agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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