Note 19 - Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Share-based Compensation, Stock Options, Activity [Table Text Block]

						Weighted-Average Remaining		Aggregate
				Weighted-Average		Contractual		Intrinsic
	Shares			Exercise Price		Life (in years)		Value (in thousands)
Balance, December 31, 2015		1,031,170			31.27		0.9	$	3,268
Exercised		(327,830	)	$	23.37
Forfeited		(620,670	)		36.50
Balance, December 31, 2016		82,670			23.37		1.1	$	1,211
Exercised		(46,790	)	$	23.37
Balance, December 31, 2017		35,880			23.37		0.1	$	675
Exercised		(35,880	)	$	23.37
Balance, December 31, 2018		-			-		0.0	$	-

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Time-Based RSUs					Performance-Based RSUs
				Weighted-Average					Weighted-Average
				Grant Date					Grant Date
	Shares			Fair Value		Shares			Fair Value
Balance at December 31, 2015		85,111			27.55		457,264			26.84
Granted		88,693			30.37		117,679			37.22
Vested		(13,780	)		29.80		-			-
Forfeited		(7,548	)		29.49		-			-
Balance at December 31, 2016		152,476			28.89		574,943			28.96
Granted		87,781			38.59		159,264			40.36
Vested		(1,167	)		38.03		(394,335	)		39.96
Forfeited		(17,352	)		33.10		-			-
Balance at December 31, 2017		221,738			32.72		339,872			33.52
Granted		141,810			43.30		55,455			39.46
Vested		(65,721	)		41.59		(121,336	)		37.87
Forfeited		(13,334	)		35.96		(8,332	)		29.61
Balance at December 31, 2018		284,493			35.79		265,659			32.90