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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) | Jul. 01, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Standard and Extended Product Warranty Accrual, Ending Balance | $ 556,000 |  | $ 666,000
Inventory, Net, Total | 17,555,000 | $ 16,986,000 | $ 17,641,000
Purchase Obligation, Total | 17,170,000 |  |
Customer Lawsuit Against Distributor [Member] | Inventory Related to Customer Involved in Lawsuit Against Distributor [Member] |  |  |
Inventory, Net, Total | $ 1,026,000 |  |

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