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Note 7 - Equity Investments in Unconsolidated Affiliate (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2005
Expense To Acquire Inventory $ 26,252,000 $ 18,623,000  
Income (Loss) from Equity Method Investments, Total 571,000 710,000  
Proceeds from Sale of Productive Assets, Total $ 1,931,000 1,087,000  
INDIA | Harmony [Member]      
Number of Stores 4    
Number Of Stores Owned 3    
Number Of Stores Rented 1    
INDIA | Harmony [Member] | Manufacturing Building Products [Member]      
Area of Real Estate Property (Square Foot) | ft² 113,000    
INDIA | Harmony [Member] | Manufacturing Coated Material and Sewing Proprietary Disposable Protective Apparel [Member]      
Area of Real Estate Property (Square Foot) | ft² 73,000    
INDIA | Harmony [Member] | Sewing Proprietary Disposable Protective Apparel [Member]      
Area of Real Estate Property (Square Foot) | ft² 16,000    
INDIA | Harmony [Member] | Manufacturing Of Building Products [Member]      
Area of Real Estate Property (Square Foot) | ft² 93,000    
Harmony [Member]      
Equity Method Investment, Other than Temporary Impairment $ 0 $ 0  
Equity Method Investments 6,120,000    
Equity Method Investment, Aggregate Cost 1,450,000    
Cumulative Equity In Income Of Unconsolidated Affiliate 5,689,000    
Proceeds from Equity Method Investment, Distribution, Return of Capital 942,000    
Proceeds from Equity Method Investment, Distribution $ 77,000    
Harmony [Member] | Alpha Pro Tech Engineered Products [Member]      
Equity Method Investment, Ownership Percentage     41.66%
Harmony [Member] | Maple Industries and Associates [Member]      
Equity Method Investment, Ownership Percentage     58.34%