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Note 11 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2017
Nov. 19, 2015
Mar. 18, 2013
Dec. 16, 2008
Aug. 29, 2008
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Feb. 29, 2016
Apr. 30, 2015
Apr. 01, 2015
Feb. 03, 2015
Jan. 31, 2015
Dec. 31, 2013
Dec. 18, 2013
Feb. 22, 2013
Oct. 16, 2012
Sep. 30, 2009
Jun. 30, 2008
Feb. 29, 2008
Debt Instrument, Interest Rate, Stated Percentage     2.00%                                  
Convertible Notes Payable           $ 6,170,000 $ 7,050,000                          
Repayments of Notes Payable           915,000 200,000                          
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,000,000                 $ 5,000,000     $ 4,000,000          
Long-term Line of Credit           $ 2,650,000                            
Line of Credit Facility, Interest Rate at Period End           3.50%                            
Interest Expense, Related Party           $ 947,688 $ 918,189                          
The Northern Trust Company [Member]                                        
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,000,000                 $ 5,000,000     $ 4,000,000          
Line of Credit Facility, Interest Rate During Period     2.00%                                  
Long-term Line of Credit           $ 2,650,000                            
Line of Credit Facility, Interest Rate at Period End           3.50%                            
Director Mr. Wit [Member]                                        
Class of Warrant or Right Cancelled During the Period   1,900,000                                    
Interest Expense, Related Party Approximately Monthly Amount     $ 9,500                                  
Chief Executive Officer [Member]                                        
Notes Payable, Related Parties                 $ 450,000                      
Debt Instrument, Interest Rate, Stated Percentage                 12.00%                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                 1,800,000                      
Repayments of Notes Payable $ 50,000                                      
Class of Warrant or Right, Exercise Price of Warrants or Rights                 $ 0.25                      
Interest Payable                 $ 450,000                      
12% Promissory Notes [Member] | Chairman and Chief Technology Officer [Member]                                        
Debt Instrument, Interest Rate, Stated Percentage                     12.00%                  
12% Promissory Notes [Member] | Chairman and Chief Technology Officer [Member]                                        
Notes Payable, Related Parties                     $ 20,000                  
Convertible Debentures [Member] | Chief Operating Officer [Member]                                        
Debt Instrument, Interest Rate, Stated Percentage                   12.00%                    
Convertible Notes Payable                   $ 25,000                    
Convertible Debentures [Member] | Director Mr. Wit [Member]                                        
Convertible Notes Payable                                     $ 510,000  
Due to Related Parties           $ 5,770,000                            
Debt Conversion, Converted Instrument, Amount         $ 510,000                              
Promissory Notes [Member] | CEO And Director [Member]                                        
Notes Payable, Related Parties           $ 400,000                            
Convertible Debenture Initiated In June 2008 [Member] | Director Mr. Wit [Member]                                        
Debt Instrument, Interest Rate, Stated Percentage         10.00%                              
Convertible Notes Payable         $ 1,260,000     $ 1,770,000         $ 1,770,000     $ 1,770,000   $ 1,770,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         3,540,000                              
Debt Instrument, Convertible, Conversion Price         $ 0.50                              
Convertible Debenture Initiated In February 2008 [Member] | Director Mr. Wit [Member]                                        
Notes Payable, Related Parties                                       $ 150,000
Convertible Notes Payable                         4,475,000     4,475,000 $ 125,000 $ 4,350,000   $ 4,200,000
Debt Conversion, Converted Instrument, Amount       $ 4,350,000                                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   1,680,000   8,700,000                         250,000      
Debt Instrument, Convertible, Conversion Price       $ 0.50                                
Debt Conversion, Converted Instrument, Rate       12.00%                                
Extinguishment of Debt, Amount   $ 420,000                                    
Class of Warrant or Right Cancelled During the Period   1,680,000                                    
Convertible Debenture Initiated In February 2008 [Member] | Director Mr. Wit [Member] | Extended Maturity Debentures [Member]                                        
Convertible Notes Payable               $ 4,055,000                        
Convertible Debentures Issued December 2008 [Member]                                        
Convertible Notes Payable       $ 5,075,000                                
Convertible Debentures Issued December 2008 [Member] | Extended Maturity Debentures [Member]                                        
Convertible Notes Payable                           $ 360,000            
Convertible Debentures Issued December 2008 [Member] | Chairman and Chief Technology Officer [Member]                                        
Convertible Notes Payable                               5,000        
Convertible Debentures Issued December 2008 [Member] | Chief Operating Officer [Member]                                        
Convertible Notes Payable                               25,000        
Convertible Debentures Issued December 2008 [Member] | Director Mr. Wit [Member]                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   1,680,000                                    
Extinguishment of Debt, Amount   $ 420,000                                    
Class of Warrant or Right Cancelled During the Period   1,680,000                                    
Convertible Debentures Issued December 2008 [Member] | Director Mr. Wit [Member] | Extended Maturity Debentures [Member]                                        
Convertible Notes Payable                         $ 4,475,000              
Convertible Debentures Issued December 2008 [Member] | Chief Executive Officer and Director Mr. Wit [Member]                                        
Repayments of Notes Payable $ 55,000                                      
Convertible Debentures Issued December 2008 [Member] | Chief Executive Officer [Member]                                        
Convertible Notes Payable                               $ 4,475,000