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Note 4 - Exit and Disposal Activities - Costs and Related Restructuring Reserves (Details) - Transition of Production from the Broadway Plant [Member] - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accrued, Beginning Balance $ 145,000  
Costs Incurred 1,394,000  
Cash Payments or Asset Write-Offs (1,539,000)  
Accrued, Ending Balance 0 $ 145,000
Employee Severance [Member]    
Accrued, Beginning Balance 145,000  
Costs Incurred 0 936,000
Cash Payments or Asset Write-Offs (145,000)  
Accrued, Ending Balance 0 145,000
Equipment Relocation Costs [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 361,000 1,424,000
Cash Payments or Asset Write-Offs (361,000)  
Accrued, Ending Balance 0 0
Other Restructuring [Member]    
Accrued, Beginning Balance 0  
Costs Incurred 1,033,000  
Cash Payments or Asset Write-Offs (1,033,000)  
Accrued, Ending Balance $ 0 $ 0