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Note 17 - Commitments and Contingencies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Operating Leases, Rent Expense, Net, Total |  | $ 1,415,000 | $ 1,427,000 |
Purchase Obligation, Total |  | 12,027,000 |  |
Accrual for Environmental Loss Contingencies, Ending Balance |  | 0 | 0 |
Inventory, Net, Total |  | 18,584,000 | 17,641,000 | $ 16,986,000
Revenue from Contract with Customer, Including Assessed Tax |  | 87,969,000 | 82,294,000 |
Inventory Valuation Reserves, Ending Balance |  | 1,414,000 | 1,165,000 |
Gain (Loss) Related to Litigation Settlement, Total |  | 1,890,000 | $ 0 |
Selling, General and Administrative Expenses [Member] |  |  |  |
Gain (Loss) Related to Litigation Settlement, Total |  | 1,890,000 |  |
New Supply Agreement [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | 293,000 |  |
Inventory Valuation Reserves, Ending Balance |  | 246,000 |  |
New Supply Agreement [Member] | Scenario, Forecast [Member] |  |  |  |
Increase (Decrease), Inventory Valuation Reserves | $ 513,000 |  |  |
Customer Lawsuit Against Distributor [Member] | Inventory Related to Customer Involved in Lawsuit Against Distributor [Member] |  |  |  |
Inventory, Net, Total |  | $ 759,000 |  |

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