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Note 5 - Notes Receivable (Details Textual) - USD ($)
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Oct. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Oct. 31, 2017
Feb. 28, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2018
Jul. 31, 2017
Subsequent Event [Member] | Shelf Registration [Member]                        
Proceeds from Issuance or Sale of Equity, Total $ 1,100,000               $ 2,100,000      
Advance to Helomics [Member]                        
Payments to Acquire Notes Receivable             $ 600,000          
Advances to De Lage Landen [Member]                        
Payments to Acquire Notes Receivable       $ 60,000   $ 67,512            
Lease to Purchase Equipment, Down Payment, Percentage           50.00%            
CytoBioscience [Member] | Promissory Notes Receivable [Member]                        
Notes Receivable, Interest Rate, Stated Percentage         8.00%             8.00%
Financing Receivable, Net, Total         $ 1,112,524 $ 1,070,000            
Notes Receivable, Term         2 years              
Proceeds from Collection of Notes Receivable                   $ 0    
Helomics Holding Corp. [Member]                        
Financing Receivable, Net, Total       $ 163,468                
Payments to Acquire Notes Receivable   $ 30,000 $ 907,500                  
Share Exchange Agreement, Outstanding Receivables, Amount Converted         $ 500,000              
Share Exchange Agreement, Shares Received Upon Conversion of Receivables         833,333              
Share Exchange Agreement, Convertible Notes, Percent of Stock         5.00%              
Investment, Ownership Percent         25.00%              
Financing Receivable, Gross   1,165,013               1,165,013 $ 1,165,013  
Interest Receivable   $ 29,215               $ 29,215 29,215  
Fair Value Adjustment of Notes Receivable                     $ (751,330)  
Helomics Holding Corp. [Member] | Subsequent Event [Member]                        
Payments to Acquire Notes Receivable               $ 305,000        
Financing Receivable, Gross 1,890,013               $ 1,890,013      
Helomics Holding Corp. [Member] | Subsequent Event [Member] | Shelf Registration [Member]                        
Payments to Acquire Notes Receivable $ 420,000