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Note 7 - Equity Investment in Unconsolidated Affiliate (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended 153 Months Ended
Jul. 01, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
Dec. 31, 2005
Expense To Acquire Inventory   $ 4,535,000 $ 3,258,000 $ 12,036,000 $ 11,097,000      
Income (Loss) from Equity Method Investments, Total $ 105,000 $ 103,000 $ 105,000 $ 393,000 $ 339,000      
INDIA | Harmony [Member]                
Number of Stores   4   4     4  
Number Of Stores Owned   3   3     3  
Number Of Stores Rented   1   1     1  
INDIA | Harmony [Member] | Manufacturing Building Products [Member]                
Area of Real Estate Property | ft²   113,000   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     73,000  
INDIA | Harmony [Member] | Sewing Proprietary Disposable Protective Apparel [Member]                
Area of Real Estate Property | ft²   16,000   16,000     16,000  
INDIA | Harmony [Member] | Manufacturing Of Building Products [Member]                
Area of Real Estate Property | ft²   93,000   93,000     93,000  
Harmony [Member]                
Equity Method Investment, Other than Temporary Impairment           $ 0    
Income (Loss) from Equity Method Investments, Total   $ 339,000   $ 393,000        
Equity Method Investments   4,286,000   4,286,000     $ 4,286,000  
Equity Method Investment, Aggregate Cost   1,450,000   1,450,000     1,450,000  
Cumulative Equity In Income Of Unconsolidated Affiliate   $ 3,855,000   $ 3,855,000     3,855,000  
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%