Note 9 - Share-based Compensation (Details Textual) $ / shares in Units, $ in Millions		9 Months Ended		12 Months Ended
		Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 $ / shares shares	Dec. 31, 2021	Dec. 31, 2020
Number Of Active Stock Incentive Plans		1
Number Of Inactive Stock Incentive Plans		1
Performance Shares [Member]
Performance Share Award Target Level, Percentage		100.00%
Performance Awards Issued Multiplier				93.00%	141.00%
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number At Target Level Of Performance (in shares)		149,000
Performance Shares [Member] | Minimum [Member]
Performance Awards Issued Multiplier		0.00%
Performance Shares [Member] | Maximum [Member]
Performance Awards Issued Multiplier		200.00%
Restricted Stock Units and Performance Stock Awards [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $		$ 4.6
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 7 months 6 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	[1]	116,622
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 30.68
Stock Awards [Member] | Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		11,380	12,606
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares		$ 30.75	$ 30.94

[1] The number of PSAs disclosed in this table are at the target level of 100%.