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Stockholders' Equity stockholders equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Class of Treasury Stock [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 Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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