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The cash outflow for cost incurred directly with the issuance of an equity security.

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Date the subsidiary or equity investee issued or sold stock, in CCYY-MM-DD format.

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Shareholders' Equity (Initial Public Offering, Preferred Stock and Common Stock, Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Aug. 10, 2009
Preferred Stock [Abstract]
Preferred stock, shares authorized	20,000,000us-gaap_PreferredStockSharesAuthorized
Common Stock [Abstract]
Share-based compensation	$ 761,663us-gaap_ShareBasedCompensation	$ 674,955us-gaap_ShareBasedCompensation	$ 636,528us-gaap_ShareBasedCompensation
Unrecognized compensation cost related to share-based payments	1,600,000
Option Exchange Program
Common Stock [Abstract]
Option Exchange Program, expiration date				May 21, 2012
Share-based compensation			0
Unrecognized compensation cost related to share-based payments			300,000
Common stock
Initial Public Offering [Abstract]
Initial public offering, effective date					Aug. 10, 2009
Initial public offering, shares issued					5,000,000
Initial public offering, price per share					$ 17.00
Initial public offering, gross proceeds					85,000,000
Initial public offering, underwriting discounts					6,000,000
Initial public offering, issuance costs					4,200,000
Initial public offering, net proceeds					$ 74,800,000
Initial public offering, number of shares common stock received in exchange for preferred stock					2
Stock Options \| Option Exchange Program
Common Stock [Abstract]
Stock options forfeited				424,475
Restricted Stock
Common Stock [Abstract]
Restricted stock granted	219,734	195,925
Restricted Stock \| Option Exchange Program
Common Stock [Abstract]
Restricted stock granted				147,828
Restricted Stock \| Option Exchange Program \| Minimum
Common Stock [Abstract]
Award vesting period				1 year
Restricted Stock \| Option Exchange Program \| Maximum
Common Stock [Abstract]
Award vesting period				4 years
Common stock
Common Stock [Abstract]
Share-based compensation, shares	15,300	19,743	20,199