Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Revenue From Contracts With Customers and Other Revenue - Changes in Contract Liabilities (Details)

v3.23.3
Note 3 - Revenue From Contracts With Customers and Other Revenue - Changes in Contract Liabilities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Total deferred revenue related to contracts with customers, beginning of period $ 700,000 $ 700,000 $ 700,000 $ 700,000
Deferred revenue related to milestones achieved 0 0 0 100,000
Deferred revenue related to milestones achieved, written off due to contract renegotiations 0 0 0 (100,000)
Total deferred revenue related to contracts with customers, end of period $ 700,000 $ 700,000 $ 700,000 $ 700,000