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Note 6 - Equity Investments in Unconsolidated Affiliate (Details Textual)
12 Months Ended
Dec. 31, 2022
USD ($)
ft²
Dec. 31, 2021
USD ($)
Dec. 31, 2005
Expense To Acquire Inventory $ 22,877,000 $ 26,252,000  
Income (Loss) from Equity Method Investments 87,000 571,000  
Proceeds from Sale of Productive Assets, Total $ 570,000 $ 1,931,000  
Harmony [Member] | INDIA      
Number of Stores 4    
Number Of Stores Owned 3    
Number Of Stores Rented 1    
Harmony [Member] | INDIA | Manufacturing Building Products [Member]      
Area of Real Estate Property | ft² 139,000    
Harmony [Member] | INDIA | Manufacturing Coated Material and Sewing Proprietary Disposable Protective Apparel [Member]      
Area of Real Estate Property | ft² 121,000    
Harmony [Member] | INDIA | Sewing Proprietary Disposable Protective Apparel [Member]      
Area of Real Estate Property | ft² 23,000    
Harmony [Member] | INDIA | Manufacturing Of Building Products [Member]      
Area of Real Estate Property | ft² 159,000    
Harmony [Member]      
Equity Method Investments $ 4,718,000    
Equity Method Investment, Aggregate Cost 1,450,000    
Cumulative Equity In Income Of Unconsolidated Affiliate 5,776,000    
Proceeds from Equity Method Investment, Distribution, Return of Capital 942,000    
Proceeds from Equity Method Investment, Distribution $ 1,489,000    
Alpha Pro Tech Engineered Products [Member] | Harmony [Member]      
Equity Method Investment, Ownership Percentage     41.66%
Maple Industries and Associates [Member] | Harmony [Member]      
Equity Method Investment, Ownership Percentage     58.34%