Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2013

Accrued Liabilities [Abstract]

Accrued liabilities

	March 31, 2013		December 31, 2012
Accrued salaries and benefits	$	2,028,576	$	2,416,268
Accrued judgments and reserves		2,450,000		2,090,000
Accrued warranty expense		496,437		483,721
Accrued income and other taxes		228,485		295,595
Other accrued expenses		1,595,126		1,779,501
Accrued liabilities	$	6,798,624	$	7,065,085