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Note 15 - Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 94,241 | 336,726 |  |
Inventory, Net, Total | $ 67,301 | $ 64,979 |  |
Other Liabilities, Current, Total | 14,767 | $ 12,409 |  |
Deferred Tax Liabilities, Net, Total | $ 8,475 |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |
Contract with Customer, Asset, Net, Total |  |  |  | $ 43,300
Inventory, Net, Total |  |  |  | (24,900)
Accounts Payable, Total |  |  |  | 2,600
Other Liabilities, Current, Total |  |  |  | 1,100
Deferred Tax Liabilities, Net, Total |  |  |  | $ 3,500
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 26,234 | 144,443 | 81,608 |
Common Stock [Member] |  |  |  |
Shares Received from Stock Options Exercised | 6,894 | 50,981 | 27,770 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 87,347 | 285,745 | 251,996 |

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