Consolidated Statement of Stockholders' Equity - USD ($)	Total	Common Stock Outstanding	Paid-In Capital	Accumulated Other Comprehensive Income	Treasury Stock	Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2020		7,980,516
Beginning Balance at Dec. 31, 2020	$ 93,932,000	$ 80,000	$ 36,127,000	$ 1,375,000	$ (28,521,000)	$ 84,871,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,456,000					3,456,000
Change in post retirement benefits, net of tax	(64,000)			(64,000)
Purchase of treasury stock					$ (47,000)
Restricted stock vested (in shares)		11,158			(3,874)
Restricted stock vested	0	$ 0
Share-based compensation	318,000		318,000
Ending Balance (in shares) at Mar. 31, 2021		7,987,800
Ending Balance at Mar. 31, 2021	$ 97,595,000	$ 80,000	36,445,000	1,311,000	$ (28,568,000)	88,327,000
Beginning Balance (in shares) at Dec. 31, 2021	8,235,740	8,235,740
Beginning Balance at Dec. 31, 2021	$ 100,095,000	$ 82,000	38,013,000	1,075,000	(28,617,000)	89,542,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,864,000					3,864,000
Change in post retirement benefits, net of tax	(64,000)			(64,000)
Restricted stock vested (in shares)		34,422
Restricted stock vested	1,000	$ 1,000
Share-based compensation	$ 501,000		501,000
Ending Balance (in shares) at Mar. 31, 2022	8,270,162	8,270,162
Ending Balance at Mar. 31, 2022	$ 104,397,000	$ 83,000	$ 38,514,000	$ 1,011,000	$ (28,617,000)	$ 93,406,000