Accrued Liabilities (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Accrued liabilities
Accrued expenses	$ 2,660,111	$ 2,224,398
Accrued salaries and benefits	1,674,266	1,549,659
Accrued litigation judgment expense	1,100,000	3,300,000
Accrued income tax	787,801	141,488
Accrued warranty expense	360,107	427,459
Accrued liabilities	$ 6,582,285	$ 7,643,004

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- 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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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