Description of Business and Basis of Presentation (Details Textual) (USD $)	6 Months Ended
Jun. 30, 2013 Segment manufacturing_location	Dec. 31, 2012
Description of Business and Basis of Presentation (Textual) [Abstract]
Manufacturing locations	2
Operating segments	1
Restricted cash	$ 4,050,000	$ 0
Warranty period, minimum, in years	1 year
Warranty period, maximum, in years	2 years
Additional paid in capital increase	2,100,000
Amount associated with stock-based compensation plans	607,000
Repurchase of shares	(41,000)
Standby Letters of Credit [Member]
Description of Business and Basis of Presentation (Textual) [Abstract]
Restricted cash	2,300,000
Collateral for Borrowing [Member]
Description of Business and Basis of Presentation (Textual) [Abstract]
Restricted cash	$ 1,800,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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