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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2020
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Number of Research Organizations       3    
Number of Operating Segments       1    
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 692,929 $ 416,361   $ 2,090,541 $ 1,256,004  
Accounts Receivable, Allowance for Credit Loss, Ending Balance 0     0   $ 0
Unrecognized Tax Benefits, Ending Balance 0     0    
Deferred Tax Assets, Net, Total $ 12,600,000     $ 12,600,000   $ 9,400,000
Deferred Tax Assets, Valuation Allowance Coverage, Percent       100.00%    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares 4,824,215 4,650,390   4,824,215 4,650,390  
Customer Concentration Risk [Member] | Revenue Benchmark [Member]            
Concentration Risk, Number of Customers 8 8   13 12  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]            
Concentration Risk, Number of Customers 5 3   7 6  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 478,000 $ 169,000   $ 1,599,000 $ 609,000  
Concentration Risk, Percentage 69.10% 40.60%   76.50% 48.50%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Concentration Risk, Number of Customers       5   9
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Non-US [Member]            
Concentration Risk, Number of Customers       4   7
Concentration Risk, Percentage       100.00%   41.60%
Accounts Receivable, after Allowance for Credit Loss, Total $ 180,000     $ 180,000   $ 123,000
Supplier Concentration Risk [Member] | Contract Research Organizations [Member]            
Concentration Risk, Number of Suppliers 2 1 1 3    
Supplier Concentration Risk [Member] | Contract Research Organizations [Member] | Two CROs [Member]            
Concentration Risk, Percentage 97.20%          
Research Services Purchased $ 1,982,000          
Supplier Concentration Risk [Member] | Contract Research Organizations [Member] | One CRO [Member]            
Concentration Risk, Percentage   99.50%     96.90%  
Research Services Purchased   $ 1,129,000     $ 3,602,000  
Supplier Concentration Risk [Member] | Contract Research Organizations [Member] | Three CROs [Member]            
Concentration Risk, Percentage       96.90%    
Research Services Purchased       $ 6,621,000    
Supplier Concentration Risk [Member] | Accounts Payable [Member]            
Concentration Risk, Number of Suppliers       2   1
Supplier Concentration Risk [Member] | Accounts Payable [Member] | Two CROs [Member]            
Concentration Risk, Percentage       80.20%    
Accounts Payable, Total $ 768,000     $ 768,000    
Supplier Concentration Risk [Member] | Accounts Payable [Member] | One CRO [Member]            
Concentration Risk, Percentage           68.10%
Accounts Payable, Total           $ 690,000