Note 13 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	Three Months Ended March 31,
	2020				2019
	Number of Shares		Weighted-Average Exercise Price per Share		Number of Shares		Weighted-Average Exercise Price per Share
Outstanding Stock Option Activity
Outstanding, beginning of period		1,068,017	$	9.78		821,470	$	11.00
Granted		161,479	$	5.36		249,283	$	5.76
Exercised		—	$	—		—	$	—
Forfeited		—	$	—		—	$	—
Outstanding, end of period		1,229,496	$	9.20		1,070,753	$	9.78
Exercisable, end of period		901,829	$	10.52		821,470	$	11.00

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

	Three Months Ended March 31,
	2020					2019
	Number of Shares			Weighted-Average Grant-Date Fair Value per Share		Number of Shares			Weighted-Average Grant-Date Fair Value per Share
Restricted Stock Unit Activity
Outstanding, beginning of period		592,116		$	6.36		469,227		$	10.75
Granted		241,556		$	5.36		135,473		$	5.76
Vested		(152,177	)	$	9.45		(229,545	)	$	10.60
Forfeited		(428	)	$	11.68		(46,571	)	$	10.89
Outstanding, end of period		681,067		$	5.32		328,584		$	8.78

Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block]

	Three Months Ended March 31,
	2020				2019
	Number of Shares		Weighted-Average Grant-Date Fair Value per Share		Number of Shares			Weighted-Average Grant-Date Fair Value per Share
Performance Share Unit Activity
Outstanding, beginning of period		—	$	—		125,422		$	11.68
Granted (at target)		—	$	—		—		$	—
Vested		—	$	—		—		$	—
Forfeited		—	$	—		(26,882	)	$	11.68
Outstanding, end of period (at target)		—	$	—		98,540		$	11.68

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

	Three Months Ended March 31,
	2020		2019
	(Dollars in thousands)
Expense related to:
Stock options	$	64	$	22
Restricted stock units and performance share units		525		544
	$	589	$	566

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended March 31,
	2020			2019
Expected term (in years)		6.0			6.0
Expected volatility		41.8	%		39.9	%
Risk-free interest rate		1.4	%		2.5	%
Expected dividends		—			—
Weighted-average grant date fair value per share	$	2.24		$	2.43