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Note 7 - Equity Investment in Unconsolidated Affiliate (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2005
Expense To Acquire Inventory $ 7,435,000 $ 3,774,000 $ 13,789,000 $ 8,480,000    
Proceeds from Sale of Productive Assets, Total 451,000 471,000 821,000 653,000    
Income (Loss) from Equity Method Investments, Total $ 188,000 $ 119,000 $ 510,000 $ 206,000    
INDIA | Harmony [Member]            
Number of Stores 4   4      
Number Of Stores Owned 3   3      
Number Of Stores Rented 1   1      
INDIA | Harmony [Member] | Manufacturing Building Products [Member]            
Area of Real Estate Property (Square Foot) | ft² 113,000   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   73,000      
INDIA | Harmony [Member] | Sewing Proprietary Disposable Protective Apparel [Member]            
Area of Real Estate Property (Square Foot) | ft² 16,000   16,000      
INDIA | Harmony [Member] | Manufacturing Of Building Products [Member]            
Area of Real Estate Property (Square Foot) | ft² 93,000   93,000      
Harmony [Member]            
Equity Method Investment, Other than Temporary Impairment     $ 0   $ 0  
Equity Method Investments $ 6,059,000   6,059,000      
Equity Method Investment, Aggregate Cost 1,450,000   1,450,000      
Cumulative Equity In Income Of Unconsolidated Affiliate $ 5,628,000   5,628,000      
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%