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Note 7 - Common Stock Options (Details Textual) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 9.29	$ 12.23	$ 9.36
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 8.4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 9 months 7 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)	6 years 7 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	3,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)	5 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	4,656,677	5,327,425	6,965,730	5,535,439
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)	36,507
The Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 9.29	$ 12.23	$ 9.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Intrinsic Value, Amount Per Share (in dollars per share)	$ 0.94	$ 6.10	$ 10.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 3.3	$ 30.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 4.8	$ 12.9	$ 2.0
The Plan [Member] | Any One Person [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum	5.00%
The Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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