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Note 1 - Summary of Significant Accounting Policies (Details Textual)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 190 Months Ended 196 Months Ended
Feb. 22, 2017
USD ($)
Nov. 29, 2016
USD ($)
Aug. 31, 2015
USD ($)
Jan. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
Feb. 21, 2018
$ / shares
Dec. 28, 2017
$ / shares
Apr. 19, 2017
$ / shares
Oct. 04, 2016
$ / shares
Dec. 31, 2015
USD ($)
Common Stock, Shares, Outstanding, Ending Balance | shares         12,089,446   12,089,446   6,943,283 4,564,428 6,943,283 12,089,446            
Common Stock, Par or Stated Value Per Share | $ / shares         $ 0.01   $ 0.01   $ 0.01 $ 0.01 $ 0.01 $ 0.01   $ 0.01 $ 0.01 $ 0.01 $ 0.01  
Retained Earnings (Accumulated Deficit), Ending Balance         $ (58,898,476)   $ (58,898,476)   $ (54,765,045) $ (47,018,451) $ (54,765,045) $ (58,898,476)            
Cash and Cash Equivalents, at Carrying Value, Ending Balance         1,004,269 $ 1,159,849 1,004,269 $ 1,159,849 766,189 1,764,090 766,189 1,004,269           $ 4,856,232
Stockholders' Equity, Period Increase (Decrease), Total                     29,065,934 35,840,380            
Stock Issued During Period, Value, New Issues             2,755,087 3,421,188 3,421,188                  
Proceeds from Issuance or Sale of Equity, Total     $ 13,800,000                              
Debt Instrument, Increase (Decrease), Net, Total                     $ 5,685,000 $ 5,685,000            
Depreciation, Total         18,825 14,519 33,321 30,204 58,872 73,249                
Amortization of Intangible Assets, Total         4,070 2,902 7,741 5,790 12,689 9,107                
Income Tax Expense (Benefit), Total         $ 0 0 $ 0 0 $ 0                  
Valuation Allowance Percentage         100.00%   100.00%   100.00%   100.00% 100.00%            
Unrecognized Tax Benefits, Ending Balance         $ 0   $ 0   $ 0   $ 0 $ 0            
Cash, Uninsured Amount         794,125   $ 794,125   $ 563,000   563,000 794,125            
Number of Operating Segments             2   2                  
Non-US [Member]                                    
Revenues, Total         $ 3,178 $ 0 $ 5,866 26,662 $ 26,662                  
Earliest Tax Year [Member]                                    
Open Tax Year             2014                      
Private Placement [Member]                                    
Stock Issued During Period, Value, New Issues                 1,213,819                  
IPO [Member]                                    
Stock Issued During Period, Value, New Issues                     13,555,003 13,555,003            
Proceeds from Issuance or Sale of Equity, Total                     3,937,500 3,937,500            
The 2016 Registered Direct Offering [Member]                                    
Stock Issued During Period, Value, New Issues                   $ 1,625,905                
Proceeds from Issuance or Sale of Equity, Net of Stock Issuance Costs   $ 1,739,770                 1,739,770 1,739,770            
Proceeds from Issuance or Sale of Equity, Total   $ 1,983,337                                
Over-Allotment Option [Member]                                    
Stock Issued During Period, Value, New Issues             $ 204,422 $ 393,750 $ 393,750                  
Proceeds from Issuance or Sale of Equity, Total $ 358,312                   358,312 358,312            
The 2018 Public Offering [Member]                                    
Proceeds from Issuance or Sale of Equity, Total       $ 2,755,000               2,755,000            
Series A Convertible Preferred Stock [Member] | Private Placement [Member]                                    
Stock Issued During Period, Value, New Issues                     2,055,000 2,055,000            
Series C Convertible Preferred Stock [Member] | Private Placement [Member]                                    
Stock Issued During Period, Value, New Issues                     $ 1,300,000 $ 1,300,000            
Helomics Holding Corp. [Member]                                    
Share Exchange Agreement, Potential Interest                         25.00%