Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Restructuring and Other Impairment Activities (Details Textual)

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Note 10 - Restructuring and Other Impairment Activities (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Restructuring Charges, Total         $ 2,100  
Gain (Loss) on Disposition of Property Plant Equipment, Total         (191) $ (134)
Inventory Write-down       $ 3,200    
Inventory Write-down, Slow Moving Finished Goods [Member]            
Inventory Write-down       2,600    
Inventory Write-down, Raw Materials Disposed of [Member]            
Inventory Write-down       $ 600    
Inventory Write-downs and Manufacturing Overhead Costs [Member]            
Restructuring Charges, Total         1,300  
Inventory Write-downs and Manufacturing Overhead Costs [Member] | Cost of Sales [Member]            
Restructuring Charges, Total         1,300  
Employee Severance and Other Payroll and Benefit Costs [Member]            
Restructuring Charges, Total         800  
Other Exit and Relocation Costs [Member]            
Restructuring Charges, Total         700  
Facility Closing, Old Fort [Member]            
Gain (Loss) on Disposition of Property Plant Equipment, Total         700  
Facility Closing, Passaic [Member]            
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total $ 12,400          
Payments for Divestiture Selling and Closing Costs $ 900          
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ 11,500   $ 11,497