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Note 1 - Organization and Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Mar. 31, 2018
Jun. 30, 2017
USD ($)
Mar. 31, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
Jan. 22, 2018
Net Income (Loss) Attributable to Parent, Total $ 1,139,178   $ (768,212)   $ 1,142,660 $ (1,638,502)    
Income (Loss) from Equity Method Investments, Total $ (176,798)   $ (260,105)   $ (320,554) $ (489,473)    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]                
Concentration Risk, Percentage 38.00% 0.00% 0.00% 0.00% 27.00% 0.00%    
Number of Major Customers 3       2      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member]                
Concentration Risk, Percentage 11.00%   14.00%   13.00% 18.00%    
Customer Concentration Risk [Member] | Accounts Receivable [Member]                
Concentration Risk, Percentage         38.00%   41.00%  
Number of Major Customers         3   2  
SAVSU [Member]                
Net Income (Loss) Attributable to Parent, Total $ (600,000)   $ (600,000)   $ (1,100,000) $ (1,100,000)    
SAVSU [Member]                
Equity Method Investment, Ownership Percentage 30.50% 26.70% 45.00%   30.50% 45.00%   35.00%
Income (Loss) from Equity Method Investments, Total $ (200,000)   $ (300,000)   $ (300,000) $ (500,000)