Note 19 - Stock-based Compensation - Options and SARS Outstanding (Details) shares in Thousands	Dec. 31, 2023 $ / shares shares
Number of SARs outstanding (in shares)	440
SARs exercisable (in shares)	336
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 38.11
Stock Options and Stock Appreciation Rights SARs Expiring in 2024 [Member]
Number of SARs outstanding (in shares)	3
SARs exercisable (in shares)	3
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 19.44
Stock Options and Stock Appreciation Rights SARs Expiring in 2025 [Member]
Number of SARs outstanding (in shares)	39
SARs exercisable (in shares)	39
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 23.02
Stock Options and Stock Appreciation Rights SARs Expiring in 2026 [Member]
Number of SARs outstanding (in shares)	76
SARs exercisable (in shares)	76
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 25.76
Stock Appreciation Rights SARs Expiring in 2027 [Member]
Number of SARs outstanding (in shares)	40
SARs exercisable (in shares)	40
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 40
Stock Appreciation Rights SARs Expiring in 2028 [Member]
Number of SARs outstanding (in shares)	95
SARs exercisable (in shares)	95
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 37.84
Stock Appreciation Rights SARs Expiring in 2029 [Member]
Number of SARs outstanding (in shares)	47
SARs exercisable (in shares)	37
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 37.06
Stock Appreciation Rights SARs Expiring In 2030 [Member]
Number of SARs outstanding (in shares)	46
SARs exercisable (in shares)	27
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 37.3
Stock Appreciation Rights SARs Expiring In 2031 [Member]
Number of SARs outstanding (in shares)	31
SARs exercisable (in shares)	12
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 50.48
Stock Appreciation Rights SARs Expiring In 2032 [Member]
Number of SARs outstanding (in shares)	34
SARs exercisable (in shares)	7
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 55.45
Stock Appreciation Rights (SARS) Expiring In 2033 [Member]
Number of SARs outstanding (in shares)	29
SARs exercisable (in shares)	0
Weighted average exercise price of SARs outstanding (in dollars per share) | $ / shares	$ 60.76