Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ 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, 2019	7,355
BALANCE at Dec. 31, 2019	$ 67,993	$ 0	$ 96,663	$ 164,656
Net income			1,188	1,188
Dividends paid on common stock			(1,030)	(1,030)
Repurchase of common stock (in shares)	(50)
Repurchase of common stock	$ (1,000)			(1,000)
Stock issued for options exercised, including tax benefits (in shares)	0
Stock issued for options exercised, including tax benefits				0
Stock compensation expense (in shares)	4
Stock compensation expense	$ 202			202
BALANCE (in shares) at Mar. 31, 2020	7,309
BALANCE at Mar. 31, 2020	$ 67,195	0	96,821	164,016
BALANCE (in shares) at Dec. 31, 2019	7,355
BALANCE at Dec. 31, 2019	$ 67,993	0	96,663	164,656
Net income				11,241
BALANCE (in shares) at Sep. 30, 2020	7,276
BALANCE at Sep. 30, 2020	$ 66,604	0	104,828	171,432
BALANCE (in shares) at Mar. 31, 2020	7,309
BALANCE at Mar. 31, 2020	$ 67,195	0	96,821	164,016
Net income			2,442	2,442
Dividends paid on common stock			(1,023)	(1,023)
Repurchase of common stock (in shares)	0
Repurchase of common stock				0
Stock issued for options exercised, including tax benefits (in shares)	0
Stock issued for options exercised, including tax benefits				0
Stock compensation expense (in shares)	3
Stock compensation expense	$ 194			194
BALANCE (in shares) at Jun. 30, 2020	7,312
BALANCE at Jun. 30, 2020	$ 67,389	0	98,240	165,629
Net income			7,611	7,611
Dividends paid on common stock			(1,023)	(1,023)
Repurchase of common stock (in shares)	(41)
Repurchase of common stock	$ (1,004)			(1,004)
Stock issued for options exercised, including tax benefits (in shares)	2
Stock issued for options exercised, including tax benefits	$ 29			29
Stock compensation expense (in shares)	3
Stock compensation expense	$ 190			190
BALANCE (in shares) at Sep. 30, 2020	7,276
BALANCE at Sep. 30, 2020	$ 66,604	0	104,828	171,432
BALANCE (in shares) at Dec. 31, 2020	7,248
BALANCE at Dec. 31, 2020	$ 65,971	0	113,534	179,505
Net income			4,492	4,492
Dividends paid on common stock			(1,015)	(1,015)
Repurchase of common stock (in shares)	0
Repurchase of common stock				0
Stock issued for options exercised, including tax benefits (in shares)	31
Stock issued for options exercised, including tax benefits	$ 607			607
Stock compensation expense (in shares)	2
Stock compensation expense	$ 278			278
BALANCE (in shares) at Mar. 31, 2021	7,281
BALANCE at Mar. 31, 2021	$ 66,856	0	117,011	183,867
BALANCE (in shares) at Dec. 31, 2020	7,248
BALANCE at Dec. 31, 2020	$ 65,971	0	113,534	179,505
Net income				8,012
BALANCE (in shares) at Sep. 30, 2021	7,295
BALANCE at Sep. 30, 2021	$ 67,662	0	118,379	186,041
BALANCE (in shares) at Mar. 31, 2021	7,281
BALANCE at Mar. 31, 2021	$ 66,856	0	117,011	183,867
Net income			3,895	3,895
Dividends paid on common stock			(1,020)	(1,020)
Repurchase of common stock (in shares)	0
Repurchase of common stock				0
Stock issued for options exercised, including tax benefits (in shares)	1
Stock issued for options exercised, including tax benefits	$ 24			24
Stock compensation expense (in shares)	1
Stock compensation expense	$ 330			330
BALANCE (in shares) at Jun. 30, 2021	7,283
BALANCE at Jun. 30, 2021	$ 67,210	0	119,886	187,096
Net income			(375)	(375)
Dividends paid on common stock			(1,132)	(1,132)
Repurchase of common stock (in shares)	0
Repurchase of common stock				0
Stock issued for options exercised, including tax benefits (in shares)	9
Stock issued for options exercised, including tax benefits	$ 125			125
Stock compensation expense (in shares)	3
Stock compensation expense	$ 327			327
BALANCE (in shares) at Sep. 30, 2021	7,295
BALANCE at Sep. 30, 2021	$ 67,662	$ 0	$ 118,379	$ 186,041