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Note 1 - Basis of Presentation and Certain Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Goodwill, Impairment Loss     $ 0      
Goodwill, Foreign Currency Translation Gain (Loss)     4,485 $ 3,596    
Amortization of Intangible Assets, Total     $ 1,100 $ 900    
Cumulative Effect of New Accounting Principle in Period of Adoption           $ (168,311)
Revenue from Contract with Customer, Including Assessed Tax, Percent 100.00% 100.00% 100.00% 100.00%    
Maximum [Member]            
Sales Revenue, Annual Gross Product Returns     0.50%      
North America Segment [Member]            
Revenue from Contract with Customer, Including Assessed Tax, Percent     95.00%      
International [Member]            
Revenue from Contract with Customer, Including Assessed Tax, Percent     5.00%      
Retained Earnings [Member]            
Cumulative Effect of New Accounting Principle in Period of Adoption           $ (168,311)
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]            
Cumulative Effect of New Accounting Principle in Period of Adoption         $ (168,311)  
Accounts Payable and Accrued Liabilities [Member]            
Gift Card Liability, Current $ 152,543   $ 152,543