SIGNIFICANT ACCOUNTING POLICIES - Schedule of Computation and Reconciliation of Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net sales
Net income attributable to DMC	$ 278	$ 3,562	$ 3,440	$ 215	$ 2,861	$ 3,754	$ 2,653	$ 2,428	$ 7,495	$ 11,696	$ 12,491
Less income allocated to RSAs									(119)	(211)	(246)
Net income allocated to common stock for EPS calculation									7,376	11,485	12,245
Shares, basic									13,533,566	13,264,636	13,089,691
EPS, basic (in dollars per share)	$ 0.02	$ 0.26	$ 0.25	$ 0.02	$ 0.21	$ 0.28	$ 0.20	$ 0.18	$ 0.55	$ 0.87	$ 0.94
Adjust shares for dilutives:
Stock-based compensation plans (in shares)									3,959	4,077	9,430
Net income per share:
Net income attributable to DMC									7,495	11,696	12,491
Less income allocated to RSAs									(119)	(211)	(246)
Net income allocated to common stock for EPS calculation									$ 7,376	$ 11,485	$ 12,245
Shares, diluted									13,537,525	13,268,713	13,099,121
EPS, diluted (in dollars per share)	$ 0.02	$ 0.26	$ 0.25	$ 0.02	$ 0.21	$ 0.28	$ 0.20	$ 0.18	$ 0.54	$ 0.87	$ 0.93