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	11,886
Stock-based compensation, Value	$ 227		227
Stock options exercised, Value	447	$ 52	395
Stock options exercised, Shares		522
Net income (loss)	2,227			2,227
Ending Balance, Value at Dec. 31, 2018	$ 24,082	$ 1,241	7,063	15,778
Ending Balance, Shares at Dec. 31, 2018	12,408	12,408
Stock-based compensation, Value	$ 149		149
Stock options exercised, Value	43	$ 5	38
Stock options exercised, Shares		54
Net income (loss)	(657)			(657)
Ending Balance, Value at Dec. 31, 2019	$ 23,617	$ 1,246	$ 7,250	$ 15,121
Ending Balance, Shares at Dec. 31, 2019	12,462	12,462