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Note 8 - Commitments and Contingencies (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leases, Rent Expense, Net |  | $ 59,000 | $ 160,000 | $ 175,000
Standard and Extended Product Warranty Accrual |  | $ 0 | $ 0 |
CooperSurgical Inc |  |  |  |
Remaining years of exclusive U.S. distribution rights for Femcare's Filshie Clip System | 4.75 |  |  |
Finite-lived Intangible Assets Acquired | $ 21,000,000 |  |  |

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