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Note 7 - Equity Investment in Unconsolidated Affiliate (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended 162 Months Ended
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
ft²
Dec. 31, 2005
Expense To Acquire Inventory $ 5,176,000 $ 3,526,000 $ 10,451,000 $ 7,500,000      
Income (Loss) from Equity Method Investments, Total $ 84,000 $ 151,000 $ 361,000 $ 290,000      
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   $ 0    
Equity Method Investments $ 4,841,000   4,841,000     $ 4,841,000  
Equity Method Investment, Aggregate Cost 1,450,000   1,450,000     1,450,000  
Cumulative Equity In Income Of Unconsolidated Affiliate $ 4,410,000   $ 4,410,000     4,410,000  
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%