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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Oct. 01, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Standard and Extended Product Warranty Accrual, Ending Balance | $ 570,000 |  | $ 570,000 | $ 570,000 |  |  | $ 666,000
Inventory, Net, Total | 18,856,000 |  | 18,856,000 | 18,856,000 |  | $ 16,986,000 | $ 17,641,000
Revenue from Contract with Customer, Including Assessed Tax | 21,101,000 | $ 21,371,000 | 64,014,000 |  | $ 60,805,000 |  |
Purchase Obligation, Total | 15,417,000 |  | 15,417,000 | 15,417,000 |  |  |
Customer Defaulted [Member] | Minimum [Member] |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss | 0 |  | 0 | 0 |  |  |
New Supply Agreement [Member] |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  | 68,000 |  |  |
Customer Lawsuit Against Distributor [Member] | Inventory Related to Customer Involved in Lawsuit Against Distributor [Member] |  |  |  |  |  |  |
Inventory, Net, Total | $ 969,000 |  | $ 969,000 | $ 969,000 |  |  |

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