Note 17 - Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

(In thousands)	For years ended December 31,
	201 8			201 7			201 6
Stock-based compensation expense before income taxes	$	4,027		$	2,892		$	2,473
Less: deferred tax benefit		(846	)		(607	)		(866	)
Reduction of net income	$	3,181		$	2,285		$	1,607

Schedule of Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions and Methodology [Table Text Block]

Assumptions	201 8			201 7			201 6
Dividend yield		2.56	%		2.72	%		2.94	%
Expected volatility		20.17	%		19.47	%		19.31	%
Risk free interest rate		2.96	%		2.29	%		1.70	%
Expected life of SARs (in years)		7.0			7.0			7.3

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block]

													Weighted
							Weighted		Aggregate		Weighted		average
	Options						average		intrinsic		average		remaining
	and SARs			Exercise			exercise		value		fair		contractual
	( I n thousands)			price			price		( I n thousands)		value		life ( I n years)
At December 31, 2016
Vested and exercisable		475		$14.02	-	24.56	$	15.72	$	14,820	$	3.16		4.3
Unvested		260		15.24	-	33.08		21.53		6,623		3.43		7.8
Total outstanding		735		14.02	-	33.08		17.78		21,443		3.26		5.5
Activity during 2017
SARs granted		46		40.00	-	40.00		40.00		–		6.34
Exercised		(77	)	14.02	-	17.89		15.41		1,855		3.18
Forfeited		–			–			–		–		–
At December 31, 2017
Vested and exercisable		490		14.02	-	33.08		16.46		10,408		3.16		4.0
Unvested		214		15.26	-	40.00		26.46		2,515		4.17		7.7
Total outstanding		704		14.02	-	40.00		19.51		12,923		3.47		5.1
Activity during 2018
SARs granted		100		35.90	-	39.32		37.75		–		6.07
Exercised		(73	)	14.02	-	19.37		15.32		1,654		3.43
Forfeited		–			–			–		–		–
At December 31, 2018
Vested and exercisable		492		14.02	-	40.00		17.69		7,505		3.21		3.8
Unvested		239		19.37	-	40.00		32.15		917		5.09		8.0
Total outstanding		731		14.02	-	40.00		22.42		8,422		3.82		5.2
Vested year-to-date		75		$15.26	-	40.00	$	23.38	$	776	$	3.77

Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights, Award Expiration Period [Table Text Block]

Expiration	Number of SARs outstanding		SARs exercisable		Weighted average exercise price of SARs outstanding
2019		24		24	$	14.76
2020		44		44		14.02
2021		74		74		15.86
2022		117		117		15.25
2023		80		80		15.26
2024		83		64		19.37
2025		76		45		22.99
2026		88		35		25.84
2027		45		9		40.00
2028		100		–		37.75
		731		492	$	22.42

Schedule of Nonvested Share Activity [Table Text Block]

				Grant date
				weighted-
	Number			average value
Unvested at December 31, 2015		156		$	18.98
Shares awarded		51			25.78
Restrictions lapsed and shares released to employees/directors		(49	)		17.98
Shares forfeited		(13	)		20.69
Unvested at December 31, 2016		145		$	21.57
Shares awarded		29			44.85
Restrictions lapsed and shares released to employees/directors		(47	)		19.79
Shares forfeited		(8	)		25.18
Unvested at December 31, 2017		119		$	27.62
Shares awarded		40			35.89
Restrictions lapsed and shares released to employees/directors		(44	)		23.62
Shares forfeited		(5	)		31.35
Unvested at December 31, 2018		110		$	32.09

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

		Fair
	Vesting	value at		Expected
Grant	period	grant		shares to
year	in years	date		be awarded
2016	3	$	22.61		69,161
2017	3		35.66		61,893
2018	3		31.54		50,352

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares to be Issued Upon Exercise and Remaining Shares Available for Future Issuance [Table Text Block]

Plan category (Shares in thousands)	Number of shares to be issued upon exercise /vesting		Weighted average exercise price		Shares available for future issuance (a)
Equity compensation plans approved by security holders:
Stock appreciation rights (SARs)		(b)		(b)		647
Restricted common stock		110		N/A		(a)
Performance stock units		(c)		N/A		(a)
Restricted stock units		7		N/A		(a)
Total shares		117				647