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Note 7 - Leases (Details Textual) $ in Thousands |  |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 08, 2019 USD ($) ft² | Jan. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Increase (Decrease) in Operating Lease Liabilities |  |  |  | $ (668) |
UNITED KINGDOM |  |  |  |  |
Decrease In Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  | $ 486 | $ 486 |
UNITED KINGDOM | Previous Accounting Guidance [Member] |  |  |  |  |
Lessee, Operating Lease, Term of Contract |  |  |  | 15 years |
Mansfield, Massachusetts [Member] |  |  |  |  |
Operating Lease, Remaining Lease Term | 3 years 120 days |  |  |  |
Operating Lease, Increase in Area | ft² | 6,100 |  |  |  |
Increase in Operating Lease Liabilities and Right-of-Use Assets, Non-cash | $ 1,819 |  |  | $ 1,819 |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Increase (Decrease) in Operating Lease Liabilities |  | $ 5,197 |  |  |
Increase (Decrease) in Operating Lease Right-of-Use Assets |  | $ 4,816 |  |  |

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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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