Consolidated Statement of Shareholders' Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2015	17,850,456
Balance at Dec. 31, 2015	$ 178,000	$ 16,526,000	$ (148,000)	$ 19,556,000	$ 36,112,000
Options exercised (in shares)	15,000				15,000
Options exercised		17,000			$ 17,000
Common stock repurchased and retired (in shares)	(2,453,900)				(2,453,900)
Common stock repurchased and retired	$ (24,000)	(6,749,000)			$ (6,773,000)
Excess tax benefit from stock options exercised		6,000			6,000
Share-based compensation expense		190,000			190,000
Net income				3,168,000	3,168,000
Other comprehensive loss			(56,000)		$ (56,000)
Balance (in shares) at Dec. 31, 2016	15,411,556				15,411,556
Balance at Dec. 31, 2016	$ 154,000	9,990,000	(204,000)	22,724,000	$ 32,664,000
Options exercised (in shares)	111,669				111,669
Options exercised	$ 1,000	209,000			$ 210,000
Common stock repurchased and retired (in shares)	(1,232,476)				(1,232,476)
Common stock repurchased and retired	$ (12,000)	(4,214,000)			$ (4,226,000)
Share-based compensation expense		296,000			296,000
Net income				2,633,000	2,633,000
Other comprehensive loss			(254,000)		$ (254,000)
Balance (in shares) at Dec. 31, 2017	14,290,749				14,290,749
Balance at Dec. 31, 2017	$ 143,000	5,415,000	$ (458,000)	26,223,000	$ 31,323,000
Cumulative-effect adjustment of change in accounting for stock-based compensation		$ (866,000)		$ 866,000