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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
Number of Research Organizations     3    
Number of Operating Segments     1    
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 937,092 $ 524,271 $ 1,397,612 $ 839,643  
Accounts Receivable, Allowance for Credit Loss, Ending Balance 0   0   $ 0
Unrecognized Tax Benefits, Ending Balance 0   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%   100.00%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares 4,799,215 4,650,390 4,799,215 4,650,390  
Customer Concentration Risk [Member] | Revenue Benchmark [Member]          
Concentration Risk, Number of Customers 11 9 13 10  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Non-US [Member]          
Concentration Risk, Number of Customers 6 4 7 5  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 797,000 $ 258,000 $ 1,121,000 $ 441,000  
Concentration Risk, Percentage 85.10% 49.20% 80.20% 52.50%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Concentration Risk, Number of Customers     8   9
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Non-US [Member]          
Concentration Risk, Number of Customers     3   7
Concentration Risk, Percentage     42.10%   41.60%
Accounts Receivable, after Allowance for Credit Loss, Total $ 123,000   $ 123,000   $ 123,000
Supplier Concentration Risk [Member] | Contract Research Organizations [Member]          
Concentration Risk, Number of Suppliers 2 1 3 1  
Supplier Concentration Risk [Member] | Contract Research Organizations [Member] | Two CROs [Member]          
Concentration Risk, Percentage 95.80%        
Research Services Purchased $ 2,622,000        
Supplier Concentration Risk [Member] | Contract Research Organizations [Member] | Three CROs [Member]          
Concentration Risk, Percentage     96.80%    
Research Services Purchased     $ 4,639,000    
Supplier Concentration Risk [Member] | Contract Research Organizations [Member] | One CRO [Member]          
Concentration Risk, Percentage   93.70%   95.80%  
Research Services Purchased   $ 1,618,000   $ 2,473,000  
Supplier Concentration Risk [Member] | Accounts Payable [Member]          
Concentration Risk, Number of Suppliers     2   1
Supplier Concentration Risk [Member] | Accounts Payable [Member] | One CRO [Member]          
Concentration Risk, Percentage     90.50%   68.10%
Accounts Payable, Total $ 2,203,000   $ 2,203,000   $ 690,000