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Note 1 - Organization and Significant Accounting Policies (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
Sep. 05, 2018
Jan. 22, 2018
Net Income (Loss) Attributable to Parent, Total $ 1,230,769 $ (318,718) $ 2,373,429 $ (1,957,220)      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]              
Concentration Risk, Percentage 41.00% 22.00% 28.00% 10.00%      
Number of Major Customers 3 2 2 1      
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Foreign Countries [Member]              
Concentration Risk, Percentage 8.00% 16.00% 10.00% 17.00%      
Customer Concentration Risk [Member] | Accounts Receivable [Member]              
Concentration Risk, Percentage     54.00%   41.00%    
Number of Major Customers     4   2    
SAVSU [Member]              
Net Income (Loss) Attributable to Parent, Total $ (16,000) $ (500,000) $ (1,100,000) $ (1,600,000)      
SAVSU [Member]              
Equity Method Investment, Ownership Percentage           44.40% 35.00%
Payments to Acquire Equity Method Investments     $ 6,000,000        
Purchase Option, Term     1 year 180 days        
Purchase Option, Additional Ownership Percentage to be Acquired     56.00%        
Purchase Option, Consideration Transferred, Equity Interests Issuable, Shares | shares 1,000,000   1,000,000        
Purchase Option, Consideration Transferred, Equity Interests Issuable $ 23,000,000   $ 23,000,000