Note 13 - Contingent Consideration - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details) $ in Millions	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Fair value (millions)	$ 1.4	$ 1.2	$ 2.6	$ 4.7	$ 7.2	$ 7.1
Measurement Input, Revenue Risk Premium [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	6.60	6.50	6.60	6.60	6.60	6.70
Measurement Input, Revenue Volatility [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	30	33	33	30	30	30
Measurement Input, Share Price [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	5.18	7.61	10.88	14.58	17.39	18.96
Measurement Input, Payment Delay [Member]
Business Combination, Contingent Consideration, Liability, Measurement Input	80	80	80	80	80	80