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Note 1 - Summary of Significant Accounting Policies - Impact of New Standard on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Contract asset | $ 49,236 |  |
Inventory | 67,301 |  | 64,979
Liabilities: |  |  |
Accounts payable | 24,685 |  | 19,752
Other current liabilities | 14,767 |  | 12,409
Deferred taxes | 8,475 |  |
Accounting Standards Update 2014-09 [Member] |  |  |
Assets: |  |  |
Inventory |  | $ (24,900) |
Liabilities: |  |  |
Other current liabilities |  | $ 1,100 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Assets: |  |  |
Contract asset |  |  |
Inventory | 95,984 |  |
Liabilities: |  |  |
Accounts payable | 21,981 |  |
Other current liabilities | 12,798 |  |
Deferred taxes | 5,589 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Assets: |  |  |
Contract asset | 49,236 |  |
Inventory | (28,683) |  |
Liabilities: |  |  |
Accounts payable | 2,704 |  |
Other current liabilities | 1,969 |  |
Deferred taxes | $ 2,886 |  |

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