SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended			0 Months Ended
	Dec. 31, 2012 item	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010	Dec. 21, 2011 Amended and restated syndicated credit agreement	Dec. 31, 2011 Amended and restated syndicated credit agreement	Dec. 31, 2011 Prior syndicated credit agreement
Other Assets
Net deferred debt issuance costs	$ 406				$ 530				$ 406	$ 530			$ 435	$ 95
Term of credit facility												5 years
Costs associated with the term loans and banks which are no longer in syndicate, expensed												284
Customer Advances
Customer advances	1,363				1,918				1,363	1,918
Basic earnings per share:
Net income attributable to DMC	2,861	3,754	2,653	2,428	3,599	4,273	3,868	750	11,696	12,491	5,265
Less income allocated to RSAs									(211)	(246)	(94)
Net income allocated to common stock for EPS calculation									11,485	12,245	5,171
Shares, basic									13,264,636	13,089,691	12,869,666
EPS, basic (in dollars per share)	$ 0.21	$ 0.28	$ 0.20	$ 0.18	$ 0.27	$ 0.32	$ 0.29	$ 0.06	$ 0.87	$ 0.94	$ 0.40
Adjust shares for dilutives:
Stock-based compensation plans (in shares)									4,077	9,430	12,088
Diluted earnings per share:
Net income attributable to DMC									11,696	12,491	5,265
Less income allocated to RSAs									(211)	(246)	(94)
Net income allocated to common stock for EPS calculation									$ 11,485	$ 12,245	$ 5,171
Shares, diluted									13,268,713	13,099,121	12,881,754
EPS, diluted (in dollars per share)	$ 0.21	$ 0.28	$ 0.20	$ 0.18	$ 0.27	$ 0.32	$ 0.29	$ 0.06	$ 0.87	$ 0.93	$ 0.40
Fair Value of Financial Instruments
Number of foreign currency hedge agreements	2								2