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Note 7 - Equity Investment in Unconsolidated Affiliate (Details Textual)
12 Months Ended 156 Months Ended
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2005
Expense To Acquire Inventory $ 16,517,000 $ 14,618,000    
Income (Loss) from Equity Method Investments, Total $ 587,000 355,000    
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 | ft² 113,000   113,000  
INDIA | Harmony [Member] | Manufacturing Coated Material and Sewing Proprietary Disposable Protective Apparel [Member]        
Area of Real Estate Property | ft² 73,000   73,000  
INDIA | Harmony [Member] | Sewing Proprietary Disposable Protective Apparel [Member]        
Area of Real Estate Property | ft² 16,000   16,000  
INDIA | Harmony [Member] | Manufacturing Of Building Products [Member]        
Area of Real Estate Property | ft² 93,000   93,000  
Harmony [Member]        
Equity Method Investment, Other than Temporary Impairment $ 0 $ 0    
Equity Method Investments 4,480,000   $ 4,480,000  
Equity Method Investment, Aggregate Cost 1,450,000   1,450,000  
Cumulative Equity In Income Of Unconsolidated Affiliate $ 4,049,000   4,049,000  
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%