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Note 6 - Equity Investment in Unconsolidated Affiliate (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
ft²
Mar. 30, 2022
USD ($)
Mar. 31, 2021
USD ($)
Mar. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2005
Expense To Acquire Inventory $ 6,183,000   $ 6,354,000      
Proceeds from Sale of Productive Assets, Total 258,000   370,000      
Income (Loss) from Equity Method Investments $ 49,000 $ 49,000 $ 322,000 $ 322,000    
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 6,169,000          
Equity Method Investment, Aggregate Cost 1,450,000          
Cumulative Equity In Income Of Unconsolidated Affiliate 5,738,000          
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%