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Note 7 - Leases (Details Textual) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 08, 2019 USD ($) ft² | Jan. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Increase (Decrease) in Operating Lease Liabilities |  |  |  |  | $ (1,378) |
Operating Lease, Right-of-Use Asset, Amortization |  |  |  |  | 1,251 |
Operating Leases, Rent Expense, Total |  |  |  |  |  | $ 1,848
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 | $ 1,811 |  |  |  | 1,811 |
NETHERLANDS |  |  |  |  |  |
Decrease In Operating Lease Liabilities and Right-of-Use Assets, Non-cash |  |  |  | $ 48 | $ 48 |
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 Represents the non-cash decrease in operating lease liabilities and right-of-use assets. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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