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Note 3 - Revenue From Contracts with Customers - Adoption of ASC 606 (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Capitalized contract costs $ 365,367   $ 240,017
Total assets 14,133,765   16,318,839 16,078,822
Accumulated deficit (69,028,467)   (66,836,475) (67,076,492)
TOTAL STOCKHOLDERS’ EQUITY 12,612,175   13,993,312 13,753,295
Total Liabilities and Stockholders’ Equity 14,133,765   16,318,839 $ 16,078,822
Selling, general and administrative expenses 1,461,854 $ 1,620,150    
Net loss (2,191,992) (1,356,187)    
Net loss available to common stockholders $ (2,348,154) $ (1,556,812)    
Basic & Diluted Loss per Common Share (in dollars per share) $ (0.30) $ (0.26)    
Change in capitalized contract costs $ 144,018    
Net cash provided by operating activities 1,043,767 $ 116,953    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Capitalized contract costs      
Selling, general and administrative expenses 1,587,204      
Net loss (2,317,342)      
Net loss available to common stockholders $ (2,473,504)      
Basic & Diluted Loss per Common Share (in dollars per share) $ (0.32)      
Change in capitalized contract costs      
Net cash provided by operating activities 1,043,767      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Capitalized contract costs 365,367      
Selling, general and administrative expenses 125,350      
Net loss (125,350)      
Net loss available to common stockholders $ (125,350)      
Basic & Diluted Loss per Common Share (in dollars per share) $ (0.02)      
Change in capitalized contract costs $ 125,350      
Net cash provided by operating activities      
Accounting Standards Update 2014-09 [Member]        
Capitalized contract costs     240,017  
Total assets     240,017  
Accumulated deficit     240,017  
TOTAL STOCKHOLDERS’ EQUITY     240,017  
Total Liabilities and Stockholders’ Equity     $ 240,017