Note 2 - Summary of Significant Accounting Policies - Remaining Performance Obligations (Details)	Jun. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Amount	$ 4,503,000
Service [Member]
Revenue, Remaining Performance Obligation, Amount	2,525,000
Clinical Revenue [Member]
Revenue, Remaining Performance Obligation, Amount	216,000
Exclusivity Fee [Member]
Revenue, Remaining Performance Obligation, Amount	$ 1,762,000