Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital in Excess of Par	Retained Earnings
Beginning Balance, Value at Dec. 31, 2017	$ 21,181	$ 1,189	$ 6,441	$ 13,551
Beginning Balance, Shares at Dec. 31, 2017		11,886
Stock-based compensation, Value	60		60
Stock options exercised, Value	88	$ 14	74
Stock options exercised, Shares		138
Net income (loss)	(196)			(196)
Ending Balance, Value at Mar. 31, 2018	$ 21,133	$ 1,203	6,575	13,355
Ending Balance, Shares at Mar. 31, 2018	11,886	12,024
Beginning Balance, Value at Dec. 31, 2018	$ 24,082	$ 1,241	7,063	15,778
Beginning Balance, Shares at Dec. 31, 2018	12,408	12,408
Stock-based compensation, Value	$ 42		42
Net income (loss)	(330)			(330)
Ending Balance, Value at Mar. 31, 2019	$ 23,794	$ 1,241	$ 7,105	$ 15,448
Ending Balance, Shares at Mar. 31, 2019	12,408	12,408