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Note 5 - Other Expense (Income), Net (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Other Nonoperating Income (Expense), Total | $ (544,000) | $ 1,256,000
Proceeds from Sale of Property, Plant, and Equipment, Total | 1,969,000 | 1,858,000
Gain (Loss) on Disposition of Property Plant Equipment, Before Abandonment Gain (Loss) | 813,000 |
Assets Disposed of by Method Other than Sale, in Period of Disposition, Gain (Loss) on Disposition | (577,000) |
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component | 728,000 | 970,000
Gain Related to Settlement Agreement |  | 1,500,000
Loss Contingency, Receivable, Proceeds |  | 1,500,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | 236,000 | 654,000
Foreign Currency Transaction Gain (Loss), before Tax, Total |  | $ 152,000
Transition of Production from the Broadway Plant [Member] |  |
Proceeds from Sale of Property, Plant, and Equipment, Total | 1,700,000 |
Proceeds from Sale of Other Property, Plant, and Equipment | $ 268,000 |

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