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Note 9 - Stockholders' Equity - Unvested Units Expected to Vest (Details) - shares | Dec. 31, 2017 | Dec. 31, 2016
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Units scheduled to vest (in shares) | 2,095,318 | 2,735,564
Share-based Compensation Award, Tranche One [Member] |  |
Units scheduled to vest (in shares) | 669,756 |
Share-based Compensation Award, Tranche Two [Member] |  |
Units scheduled to vest (in shares) | 549,041 |
Share-based Compensation Award, Tranche Three [Member] |  |
Units scheduled to vest (in shares) | 622,036 |
Share-based Compensation Award, Tranche Four [Member] |  |
Units scheduled to vest (in shares) | 254,485 |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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