Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2017	14,290,749
Balance at Dec. 31, 2017	$ 143,000	$ 5,415,000	$ (458,000)	$ 26,223,000	$ 31,323,000
Common stock repurchased and retired (in shares)	(453,000)
Common stock repurchased and retired	$ (5,000)	(1,612,000)			(1,617,000)
Stock-based compensation expense		196,000			196,000
Options exercised (in shares)	71,667
Options exercised	$ 1,000	119,000			120,000
Net income				1,467,000	1,467,000
Balance (in shares) at Jun. 30, 2018	13,909,416
Balance at Jun. 30, 2018	$ 139,000	4,118,000		27,232,000	31,489,000
Cumulative-effect adjustment of change in accounting for unrealized loss on marketable securities			$ 458,000	(458,000)
Balance (in shares) at Dec. 31, 2018	13,502,684				13,502,684	[1]
Balance at Dec. 31, 2018	$ 135,000	2,669,000		29,390,000	$ 32,194,000	[2]
Common stock repurchased and retired (in shares)	(427,000)
Common stock repurchased and retired	$ (4,000)	(1,632,000)			(1,636,000)
Stock-based compensation expense		260,000			$ 260,000
Options exercised (in shares)	33,334				33,334
Options exercised		59,000			$ 59,000
Net income				2,228,000	$ 2,228,000
Balance (in shares) at Jun. 30, 2019	13,109,018				13,109,018
Balance at Jun. 30, 2019	$ 131,000	$ 1,356,000		$ 31,618,000	$ 33,105,000

[1] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.

[2] The condensed consolidated balance sheet as of December 31, 2018 has been prepared using information from the audited consolidated balance sheet as of that date.