Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement [Abstract]
NET SALES	$ 9,823	$ 19,914	$ 14,108	$ 12,808	$ 9,546	$ 11,401	$ 10,489	$ 9,585	$ 56,653	$ 41,021	$ 31,016
Cost of sales	8,546	16,068	10,441	9,618	7,024	9,026	8,183	7,494	44,673	31,727	24,258
GROSS MARGIN	1,277	3,846	3,667	3,190	2,522	2,375	2,306	2,091	11,980	9,294	6,758
Technical services and research and development	111	90	101	82	81	74	66	66	384	287	254
Selling, general and administrative expenses	1,204	1,242	1,359	1,224	1,317	1,098	1,065	1,159	5,029	4,639	3,701
Gain on disposal of assets		(6)			(1)				(6)	(1)
OPERATING INCOME	(38)	2,520	2,207	1,884	1,125	1,203	1,175	866	6,573	4,369	2,803
OTHER INCOME (EXPENSES):
Interest expense	(74)	(143)	(112)	(142)	(135)	(139)	(101)	(96)	(471)	(471)	(439)
Loss on foreign currency exchange rate	(29)	(24)	(20)	23	(29)	63	(9)	(48)	(50)	(23)	(60)
Other, net	(1)		1		2		7			9
INCOME BEFORE INCOME TAX	(142)	2,353	2,076	1,765	963	1,127	1,072	722	6,052	3,884	2,304
Income tax expense	(378)	516	517	369	(150)	60	91	47	1,024	48	16
NET INCOME	236	1,837	1,559	1,396	1,113	1,067	981	675	5,028	3,836	2,288
Less: Preferred Stock Dividends					1			15		16	60
Basic Income Available to Common Shareholders	236	1,837	1,559	1,396	1,112	1,067	981	660	5,028	3,820	2,228
Plus: 6% Convertible Debenture Interest Expense				22	21	22	22	22	22	87	90
Plus: Preferred Stock Dividends					1			15		16
Diluted Income Available to Common Shareholders	$ 236	$ 1,837	$ 1,559	$ 1,418	$ 1,134	$ 1,089	$ 1,003	$ 697	$ 5,050	$ 3,923	$ 2,318
Income per common share:
Basic (in dollars per share)	$ 0.08	$ 0.62	$ 0.56	$ 0.58	$ 0.51	$ 0.50	$ 0.47	$ 0.34	$ 1.81	$ 1.84	$ 1.17
Diluted (in dollars per share)	$ 0.07	$ 0.53	$ 0.45	$ 0.41	$ 0.35	$ 0.33	$ 0.30	$ 0.22	$ 1.49	$ 1.21	$ 0.83
Weighted average common shares outstanding:
Basic (in shares)	2,980	2,968	2,769	2,402	2,160	2,122	2,091	1,941	2,781	2,079	1,904
Diluted (in shares)	3,424	3,441	3,462	3,439	3,239	3,264	3,293	3,149	3,394	3,235	2,785