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Note 6 - Share-based Payments (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block]

Directors’ Restricted Stock Awards		2019								2018								2017
		Shares				Weighted Average Grant-Date Fair Value				Shares				Weighted Average Grant-Date Fair Value				Shares				Weighted Average Grant-Date Fair Value
Nonvested, Beginning of Year			43,225			$	37.53				46,800			$	32.65				46,334			$	29.71
Granted			15,700				49.73				18,200				43.40				17,600				37.75
Vested			18,320				36.02				21,775				31.94				17,134				29.93
Forfeited			-								-								-
Nonvested, End of Year			40,605				42.93				43,225				37.53				46,800				32.65
Compensation Expense Recognized						$	776,000							$	661,000							$	658,000
Fair Value of Shares Vested in Year						$	660,000							$	696,000							$	513,000

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

Employees’ Restricted Stock Awards		2019								2018								2017
		Shares				Weighted Average Grant-Date Fair Value				Shares				Weighted Average Grant-Date Fair Value				Shares				Weighted Average Grant-Date Fair Value
Nonvested, Beginning of Year			-				-				2,895			$	29.41				7,180			$	29.72
Granted			-								-								-
Vested			-				-				2,895				29.41				4,285				29.94
Forfeited			-								-								-
Nonvested, End of Year			-				-				-				-				2,895				29.41
Compensation Expense Recognized						$	-							$	16,000							$	70,000
Fair Value of Awards Vested						$	-							$	85,000							$	128,000

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

Employees’ Restricted Stock Unit Awards		2019								2018								2017
		Restricted Stock Units				Weighted Average Grant-Date Fair Value				Restricted Stock Units				Weighted Average Grant-Date Fair Value				Restricted Stock Units				Weighted Average Grant-Date Fair Value
Nonvested, Beginning of Year			49,470			$	31.03				46,440			$	27.07				47,370			$	25.19
Granted			13,270				44.45				14,780				38.99				10,995				33.28
Vested			13,250				27.62				8,925				25.23				11,550				25.30
Forfeited			1,900				34.57				2,825				25.86				375				26.92
Nonvested, End of Year			47,590				35.58				49,470				31.03				46,440				27.07
Compensation Expense Recognized						$	427,000							$	351,000							$	331,000
Fair Value of Awards Vested						$	366,000							$	225,000							$	292,000

Executive Officers and Key Employees [Member]

Notes Tables

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

Dividend Equivalent Restricted Stock Unit Awards		2019								2018								2017
		Shares				Weighted Average Grant-Date Fair Value				Shares				Weighted Average Grant-Date Fair Value				Shares				Weighted Average Grant-Date Fair Value
Nonvested, Beginning of Year			45,300			$	35.70				47,750			$	32.71				41,825			$	30.23
Granted			16,200				49.72				15,200				41.325				15,900				37.65
Vested			15,850				34.46				17,650				32.462				9,975				30.16
Forfeited			-								-								-
Nonvested, End of Year			45,650				41.10				45,300				35.70				47,750				32.71
Compensation Expense Recognized						$	1,055,000							$	769,000							$	576,000
Fair Value of Awards Vested						$	546,000							$	573,000							$	301,000

Stock Performance Awards [Member]

Notes Tables

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

Performance Period			Maximum Shares Subject To Award				Target Shares				Expense Recognized in the Year Ended December 31,												Earned Shares
											2019				2018				2017
2019-2021				83,400				55,600			$	2,168,000
2018-2020				81,000				54,000				897,000			$	1,121,000
2017-2019				89,250				59,500				524,000				729,000			$	854,000				69,997
2016-2018				122,250				81,500				8,000				772,000				580,000				113,298
2015-2017				126,450				84,300				-				23,000				573,000				114,648
Total											$	3,597,000			$	2,645,000			$	2,007,000				297,943

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