Note 7 - Stock Plans (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

	June 30, 2022					June 30, 2021
				Weighted-					Weighted-
	Shares			average grant		Shares			average grant
	granted			date fair value		granted			date fair value
Director plan		18,000	(2)	$	49.85		12,500	(2)	$	52.00
Omnibus plan		16,520	(3)		49.85		13,552	(3)		52.00
Omnibus plan		50	(1)		35.91		50	(1)		58.17
Omnibus plan		-					36	(3)		58.17
Total		34,570		$	49.83		26,138		$	52.02

Nonvested Restricted Stock Shares Activity [Table Text Block]

	2012 Stock incentive plans
	Director			Omnibus			Total			Weighted- average grant date fair value
Non-vested balance at December 31, 2021		14,920			28,123			43,043			53.20
Granted		18,000			16,570			34,570			49.83
Forfeited		-			(1,533	)		(1,533	)		52.26
Vested		(9,048	)		(2,493	)		(11,541	)		52.84
Non-vested balance at June 30, 2022		23,872			40,667			64,539		$	51.48

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

	Awards		Weighted-average grant date fair value		Weighted-average remaining contractual term (years)
Outstanding December 31, 2021		94,332		9.66		5.5
Granted		-
Exercised		-
Forfeited		-
Outstanding June 30, 2022		94,332	$	9.66		5.0

Share-Based Payment Arrangement, Cost by Plan [Table Text Block]

	Three months ended June 30,				Six months ended June 30,
(dollars in thousands)	2022		2021		2022		2021
Stock-based compensation expense:
Director stock incentive plan	$	263	$	94	$	372	$	169
Omnibus stock incentive plan		150		157		315		314
Employee stock purchase plan		-		-		32		44
Total stock-based compensation expense	$	413	$	251	$	719	$	527

Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block]

	As of
(dollars in thousands)	June 30, 2022
Unrecognized stock-based compensation expense:
Director plan	$	1,024
Omnibus plan		1,212
Total unrecognized stock-based compensation expense	$	2,236