Summary of significant accounting policies (Details Textual) (USD $)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Amortization Of Intangible Assets	$ 17,000	$ 17,000	$ 0	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	102,000	102,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	204,000	204,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three	204,000	204,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	204,000	204,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	204,000	204,000
Credit Period Offered By Entity		The Company generally offers terms that require payment 30 - 45 days from invoicing.
Mgt [Member]
Proceeds From Sale Of Convertible Notes		$ 3,500,000
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount		6	31
Stock Options Weighted Average Price Per Share		$ 46,326	$ 78,000