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Note 7 - Leases (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Lease, Liability, Total | $ 5,209 |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 238 | $ 1,126
Operating Lease, Weighted Average Remaining Lease Term | 13 years |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 12.60% |  |  |
Operating Lease, Expense | $ 309 |  |  |
Accrued Liabilities, Current [Member] |  |  |  |
Operating Lease, Liability, Current | 1,320 |  |  |
Other Noncurrent Liabilities [Member] |  |  |  |
Operating Lease, Liability, Noncurrent | 3,889 |  |  |
Other Noncurrent Assets [Member] |  |  |  |
Operating Lease, Right-of-Use Asset | $ 3,981 |  |  |
Minimum [Member] |  |  |  |
Lessee, Operating Lease, Term of Contract | 1 year |  |  |
Maximum [Member] |  |  |  |
Lessee, Operating Lease, Term of Contract | 5 years |  |  |
Retained Earnings [Member] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 238 | $ 1,126
Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  | $ 3,621 |  |
Operating Lease, Liability, Total |  | 4,822 |  |
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  | $ 238 |  |

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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