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Note 1 - Organization and Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
Equity Method Investment, Ownership Percentage 26.70%   35.00%
Net Income (Loss) Attributable to Parent, Total $ 3,482 $ (870,290)  
Income (Loss) from Equity Method Investments, Total $ (143,756) $ (229,368)  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]      
Number of Major Customers 2 2  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Two Customers [Member]      
Concentration Risk, Percentage 30.00% 21.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Number of Major Customers 2   2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]      
Concentration Risk, Percentage 34.00%   41.00%
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member]      
Concentration Risk, Percentage 13.00% 22.00%  
SAVSU [Member]      
Income (Loss) from Equity Method Investments, Total $ (143,756) $ (229,368)  
SAVSU [Member]      
Net Income (Loss) Attributable to Parent, Total $ (538,413) $ (509,706)