Financing Arrangements (Details Textual) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended
	Dec. 22, 2011	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2012	May 31, 2012	Sep. 25, 2011
Financing arrangements (Textual) [Abstract]
Line of credit agreement, extended period	3 years
Maximum aggregate principal amount of borrowings allowed				$ 35,000,000	$ 22,500,000
Base rate of credit agreement			LIBOR
Interest rate on credit agreement		1.75%	1.75%
Annual commitment fee on unused balance			0.20%
Borrowing base limitation			0
Tangible net						45,000,000
Quarterly net income						25.00%
Net worth		1.5
Current ratio		1.75
Net income after tax		$ 1