Note 17 - Stock-based Compensation - Options and SARS Outstanding (Details) shares in Thousands	Dec. 31, 2016 $ / shares shares
Number of options and SARs outstanding (in shares)	735
Options and SARs exercisable (in shares)	475
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 17.78
Stock Options and Stock Appreciation Rights SARs Expiring in 2017 [Member]
Number of options and SARs outstanding (in shares)	4
Options and SARs exercisable (in shares)	4
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 17.89
Stock Options and Stock Appreciation Rights SARs Expiring in 2018 [Member]
Number of options and SARs outstanding (in shares)	43
Options and SARs exercisable (in shares)	43
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 15.58
Stock Options and Stock Appreciation Rights SARs Expiriing in 2019 [Member]
Number of options and SARs outstanding (in shares)	53
Options and SARs exercisable (in shares)	53
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 14.76
Stock Options and Stock Appreciation Rights SARs Expiring in 2020 [Member]
Number of options and SARs outstanding (in shares)	79
Options and SARs exercisable (in shares)	79
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 14.02
Stock Options and Stock Appreciation Rights SARs Expiring in 2021 [Member]
Number of options and SARs outstanding (in shares)	84
Options and SARs exercisable (in shares)	84
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 15.85
Stock Options and Stock Appreciation Rights SARs Expiring in 2022 [Member]
Number of options and SARs outstanding (in shares)	134
Options and SARs exercisable (in shares)	107
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 15.25
Stock Options and Stock Appreciation Rights SARs Expiring in 2023 [Member]
Number of options and SARs outstanding (in shares)	80
Options and SARs exercisable (in shares)	52
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 15.26
Stock Options and Stock Appreciation Rights SARs Expiring in 2024 [Member]
Number of options and SARs outstanding (in shares)	94
Options and SARs exercisable (in shares)	38
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 19.37
Stock Options and Stock Appreciation Rights SARs Expiring in 2025 [Member]
Number of options and SARs outstanding (in shares)	76
Options and SARs exercisable (in shares)	15
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 22.99
Stock Options and Stock Appreciation Rights SARs Expiring in 2026 [Member]
Number of options and SARs outstanding (in shares)	88
Options and SARs exercisable (in shares)
Weighted average exercise price of options and SARs outstanding (in dollars per share) | $ / shares	$ 25.84