Note 11 - Stock Option Plan (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	DECEMBER 31, 201 8					DECEMBER 31, 201 7
	Shares			Weighted- Average Exercise Price		Shares			Weighted- Average Exercise Price
Outstanding at beginning of year		3,500		$	5.94		15,000		$	9.58
Granted		0		$	0.00		0		$	0.00
Exercised		(1,500	)	$	4.58		(9,000	)	$	10.10
Forfeited		(1,000	)	$	8.25		(2,500	)	$	12.75
Outstanding at end of year		1,000		$	5.74		3,500		$	5.94

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

	DECEMBER 31, 2018					DECEMBER 31, 2017
	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value
Unvested at beginning of year		24,800		$	11.07		56,075		$	8.16
Granted		96,650		$	21.40		8,000		$	14.62
Vested		(11,900	)	$	11.93		(32,425	)	$	7.45
Cancelled		(1,950	)	$	20.21		(6,850	)	$	8.54
Unvested at end of year		107,600		$	20.09		24,800		$	11.07

Weighted Average [Member]

Notes Tables

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

(dollars in thousands)	December 31,
	201 8		201 7
Weighted-average fair value of options granted during the year		N/A		N/A
Intrinsic value of options exercised	$	20	$	56
Options outstanding and exercisable at year end:		1,000		3,500
Weighted average exercise price	$	5.74	$	5.94
Intrinsic value	$	13	$	48
Weighted average remaining contractual life (in months)		1		9