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Note 4 - Supplemental Cash Flow Information (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Income Taxes Paid |  | $ 200 | $ 400 |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  | $ 1,000 | $ 200 |  |  |
Company Stock Received in Lieu of Cash Stock Options Exercised |  | 11,183 | 5,863 |  |  |
Stock Issued During Period, Shares, New Issues |  | 27,172 | 20,234 |  |  |
Inventory, Net, Total | [1] | $ 65,753 |  |  | $ 67,301 |
Other Liabilities, Current, Total |  | 15,703 |  |  | 14,767 |
Operating Lease, Right-of-Use Asset |  | 4,581 |  |  |  |
Prepaid Expense and Other Assets, Current |  | 11,488 |  |  | 9,552 |
Other Assets, Noncurrent, Total |  | 9,796 |  |  | 8,832 |
Operating Lease, Liability, Noncurrent |  | $ 2,866 |  |  |  |
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
Operating Lease, Right-of-Use Asset |  |  |  | $ 4,900 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Other Liabilities, Current, Total |  |  |  | 1,000 |  |
Operating Lease, Right-of-Use Asset |  |  |  | 4,900 |  |
Prepaid Expense and Other Assets, Current |  |  |  | (100) |  |
Other Assets, Noncurrent, Total |  |  |  | (700) |  |
Operating Lease, Liability, Noncurrent |  |  |  | $ 3,100 |  |
[1] | Inventories consist of the following: March 31, 2019 December 31, (Unaudited) 2018 Finished goods $ 56,552 $ 58,196 Work in process 527 650 Raw materials 8,674 8,455 $ 65,753 $ 67,301

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