Shareholders' Equity (Details Textual) (USD $)	1 Months Ended	12 Months Ended
	Aug. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Aug. 11, 2011
Shareholders' Equity (Textual) [Abstract]
Number of Stock Option Granted		163,000	95,000
Employees offering dates intervals		6 months
Repurchased of common stock value		$ 456,000	$ 991,000
Stock repurchase and retirement, Shares		62,519	91,790
Shareholders' Equity (Additional Textual) [Abstract]
Authorized share buy back program, number of shares				500,000
Share repurchase period			18 months
Current market price of purchased shares			$ 5.84
Number of Stock Awards Granted		0	0
Share-based compensation expense			700,000
Equity compensation expense capitalized in inventory or fixed assets		0
Employee stock purchase plan expense		16,000	40,000
Weighted-average fair value of stock options granted		$ 3.81	$ 3.40
Expected Volatility Rate		60.00%	62.00%
Expected Term Period		6 years 2 months 12 days	6 years 9 months 18 days
Risk-Free Interest Rate minimum			2.30%
Risk-Free Interest Rate Maximum			3.00%
Risk-Free Interest Rate		1.20%
Expected Dividends		0	0
Cash Received from Employee Stock Option Exercised		248,000	112,000
Intrinsic Value of Option Exercised		109,000	166,000
Warrants issued to acquire Icarus Share		250,000
Warrants exercise price		9.07
Warrants expiration date		Dec. 26, 2016
Expected dividend rate		1.90%
Issuance of common stock dividend Reinvestment Plan	750,000
Executive Officer [Member]
Shareholders' Equity (Textual) [Abstract]
Repurchased of common stock value			$ 431,000
Stock repurchase and retirement, Shares			73,741
Employee Stock Option [Member]
Shareholders' Equity (Textual) [Abstract]
Number of Shares Authorized In Employee Stock Purchase Plan		1,500,000
Employee Stock Purchase Plan Period		10 years
Discount from market price		15.00%
Performance Shares [Member]
Shareholders' Equity (Textual) [Abstract]
Number of performance-based awards outstanding		0	0
Maximum [Member] | Employee Stock Option [Member]
Shareholders' Equity (Textual) [Abstract]
Employee Stock Purchase Plan Period		3 years
2007 Plan [Member]
Shareholders' Equity (Textual) [Abstract]
Number of Stock Option Granted		161,000
Number of shares reserved for issuance		2,000,000
Shares available for future grant		574,792
2007 Plan [Member] | Maximum [Member] | Employee Stock Option [Member]
Shareholders' Equity (Textual) [Abstract]
Employee Stock Purchase Plan Period		5 years
2007 Plan [Member] | Maximum [Member] | Non Employee Stock Option [Member]
Shareholders' Equity (Textual) [Abstract]
Stock Awards or Option to Non Employees Vesting Period		3 years
2007 Plan [Member] | Minimum [Member] | Employee Stock Option [Member]
Shareholders' Equity (Textual) [Abstract]
Employee Stock Purchase Plan Period		3 years
2007 Plan [Member] | Minimum [Member] | Non Employee Stock Option [Member]
Shareholders' Equity (Textual) [Abstract]
Stock Awards or Option to Non Employees Vesting Period		1 year
1997 Plan [Member]
Shareholders' Equity (Textual) [Abstract]
Number of shares reserved for issuance		1,500,000
Number of shares left unused		1,036,300