Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - 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				14,290,749	[1]
Balance at Dec. 31, 2017	$ 143,000	$ 5,415,000	$ (458,000)	$ 26,223,000	$ 31,323,000	[2]
Common stock repurchased and retired (in shares)	(153,000)
Common stock repurchased and retired	$ (1,000)	(575,000)			(576,000)
Stock-based compensation expense		78,000			$ 78,000
Options exercised (in shares)	50,000				50,000
Options exercised		77,000			$ 77,000
Net income				508,000	$ 508,000
Cumulative-effect adjustment of change in accounting for unrealized loss on marketable securities			458,000	(458,000)
Balance (in shares) at Mar. 31, 2018	14,187,749				14,187,749
Balance at Mar. 31, 2018	$ 142,000	$ 4,995,000		$ 26,273,000	$ 31,410,000

[1] The condensed consolidated balance sheet as of December 31, 2017 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, 2017 has been prepared using information from the audited consolidated balance sheet as of that date.