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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Percentage of LIFO Inventory 72.00% 71.00%  
Depreciation, Total $ 11,200 $ 11,400 $ 12,600
Goodwill, Impairment Loss 0 0 0
Advertising Expense 1,900 2,100 3,000
Performance Shares [Member]      
Share-based Payment Arrangement, Expense $ 2,000 $ 300 $ 700
The 2015 Omnibus Incentive Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 2 years    
The 2015 Omnibus Incentive Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Number of Major Customers 0 0 0