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Note 12 - Commitments and Contingencies (Details Textual) - USD ($)
Apr. 05, 2020
Dec. 31, 2019
Standard and Extended Product Warranty Accrual, Ending Balance $ 581,000 $ 569,000
Accrual for Environmental Loss Contingencies, Ending Balance 0 $ 0
Purchase Obligation, Total $ 7,977,000