Consolidated Statement of Shareholders' Equity - USD ($) $ in Thousands		Common Stock Including Additional Paid in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
BALANCE (in shares) at Dec. 31, 2018		7,368,000
BALANCE at Dec. 31, 2018		$ 68,387	$ 0	$ 83,188	$ 151,575
Net income				17,462	17,462
Dividends paid on common stock	[1]			(3,987)	(3,987)
Repurchase of common stock (in shares)		(54,000)
Repurchase of common stock		$ (1,500)			(1,500)
Stock issued for options exercised, including tax benefits (in shares)		28,000
Stock issued for options exercised, including tax benefits		$ 444			444
Stock compensation expense (in shares)		13,000
Stock compensation expense		$ 662			662
BALANCE (in shares) at Dec. 31, 2019		7,355,000
BALANCE at Dec. 31, 2019		$ 67,993	0	96,663	164,656
Net income				20,964	20,964
Dividends paid on common stock				(4,093)	(4,093)
Repurchase of common stock (in shares)		(129,000)
Repurchase of common stock		$ (2,938)			$ (2,938)
Stock issued for options exercised, including tax benefits (in shares)		8,000			8,800
Stock issued for options exercised, including tax benefits		$ 136			$ 136
Stock compensation expense (in shares)		14,000
Stock compensation expense		$ 780			780
BALANCE (in shares) at Dec. 31, 2020		7,248,000
BALANCE at Dec. 31, 2020		$ 65,971	$ 0	$ 113,534	$ 179,505

[1] Dividend was increased from $0.12 per share to $0.14 per share in the second quarter of 2019