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Organization and Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of changes in estimated product warranty liabilities
Balance, beginning of period	$ 483,721	$ 427,459
Utilization of accrual	(156,052)	(91,860)
Warranty expense (recovery)	168,768	(35,944)
Balance, end of period	$ 496,437	$ 299,655

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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