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Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Stock options and warrants [Abstract]
Shares issued for warrants exercised	1,161,570
Value of shares issued for warrants exercised	$ 1,580,000
Exercise price of warrants	1.36		1.36
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	403,021	484,222
Nonqualified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	3,460,935		4,622,505
Stock-based compensation expense	0	14,000
Fair value of options vested	0	14,178
Unrecognized compensation expense	$ 0

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Exercise price per share or per unit of warrants or rights outstanding.

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Unrecognized cost of unvested share-based compensation awards.

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Number of options outstanding, including both vested and non-vested options.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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