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v3.21.2

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

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