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, 2020		7,248
BALANCE at Dec. 31, 2020		$ 65,971	$ 0	$ 113,534	$ 179,505
Net income				20,559	20,559
Dividends paid on common stock	[1]			(4,299)	(4,299)
Repurchase of common stock		$ 0		0	0
Stock issued for options exercised, including tax benefits (in shares)		47
Stock issued for options exercised, including tax benefits		$ 825			825
Stock compensation expense (in shares)		7
Stock compensation expense		$ 1,265			1,265
BALANCE (in shares) at Dec. 31, 2021		7,302
BALANCE at Dec. 31, 2021		$ 68,061	0	129,794	197,855
Net income				20,465	20,465
Dividends paid on common stock				(4,538)	(4,538)
Repurchase of common stock		$ 0		0	0
Stock issued for options exercised, including tax benefits (in shares)		26
Stock issued for options exercised, including tax benefits		$ 461			461
Stock compensation expense (in shares)		11
Stock compensation expense		$ 1,230			1,230
BALANCE (in shares) at Dec. 31, 2022		7,339
BALANCE at Dec. 31, 2022		$ 69,752	0	145,721	215,473
Net income				10,426	10,426
Dividends paid on common stock				(4,565)	(4,565)
Repurchase of common stock		$ 0		0	$ 0
Stock issued for options exercised, including tax benefits (in shares)		39			38,400
Stock issued for options exercised, including tax benefits		$ 977			$ 977
Stock compensation expense (in shares)		34
Stock compensation expense		$ 1,244			1,244
BALANCE (in shares) at Dec. 31, 2023		7,412
BALANCE at Dec. 31, 2023		$ 71,973	$ 0	$ 151,582	$ 223,555

[1] Quarterly dividend was increased from $0.14 per share to $0.155 per share in the third quarter of 2021.