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Income taxes (Valuation and Qualifying Accounts) (Details) - Deferred tax asset valuation allowance - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Balance at Beginning of Period $ 4,078,470 $ 3,882,154
Charged to Cost and Expenses 66,271 196,316
Write-offs
Other Charges
Balance at End of Period $ 4,144,741 $ 4,078,470