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Note 1 - Basis of Presentation and Certain Significant Accounting Policies (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue, Percent 100.00% 100.00%
Retail [Member]    
Revenue, Percent 62.00% 59.00%
Non-Retail [Member]    
Revenue, Percent 38.00% 41.00%