Note 7 - Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Stock options and SARs	$	326	$	345	$	778	$	510
Restricted stock		435		203		638		363
Performance shares		76		114		253		188
Total share-based compensation expense	$	837	$	662	$	1,669	$	1,061

Share-based Payment Arrangement, Option, Activity [Table Text Block]

						Weighted Average		Aggregate
	No. of			Weighted Average		Remaining Life		Intrinsic Value
	Shares			Exercise Price		(in years)		(in thousands)
Outstanding, January 1, 2021		970,022		$	12.92		3.74	$	11,128
Granted(1)		114,263			25.80
Exercised		(234,092	)		9.96
Lapsed or cancelled		(12,740	)		14.09
Outstanding, June 30, 2021		837,453			15.49		3.60		7,268
Exercisable, June 30, 2021		484,635			14.38		3.07		4,624

Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block]

						Weighted Average		Aggregate
	No. of			Weighted Average		Remaining Life		Intrinsic Value
	Shares			Exercise Price		(in years)		(in thousands)
Outstanding, January 1, 2021		317,128		$	13.47		3.36	$	2,031
Granted(1)		31,687			25.75
Exercised		(21,438	)		16.19
Outstanding, June 30, 2021		327,377			14.48		3.14		3,146
Exercisable, June 30, 2021		165,586			15.08		2.50		1,462

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]

				Weighted Average
	No. of			Grant Date
	Shares			Fair Value
Outstanding, January 1, 2021		157,244		$	16.84
Granted		159,889			22.62
Vested		(24,908	)		23.55
Outstanding, June 30, 2021		292,225			19.43

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

				Weighted Average
	No. of			Grant Date
	Shares			Fair Value
Outstanding, January 1, 2021		186,264		$	18.28
Granted		34,135			23.20
Vested		(57,255	)		17.54
Forfeited		(36,141	)		15.19
Outstanding, June 30, 2021		127,003			20.82