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Note 10 - Stockholders' Equity - Unvested Units Expected to Vest (Details) - shares | Dec. 31, 2018 | Dec. 31, 2017
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Units scheduled to vest (in shares) | 2,689,468 | 2,095,318
Share-based Compensation Award, Tranche One [Member] |  |
Units scheduled to vest (in shares) | 1,246,291 |
Share-based Compensation Award, Tranche Two [Member] |  |
Units scheduled to vest (in shares) | 866,680 |
Share-based Compensation Award, Tranche Three [Member] |  |
Units scheduled to vest (in shares) | 576,497 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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