The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Inventories (Details Textual) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Inventories (Textual) [Abstract]
Inventory reserves	$ 1,783,000	$ 1,793,000	$ 1,676,000	$ 4,141,000
Climate Control products [Member]
Inventories (Textual) [Abstract]
Inventory reserves	1,767,000	1,616,000
Chemical products [Member]
Inventories (Textual) [Abstract]
Inventory reserves	$ 16,000	$ 177,000