Quarterly report pursuant to Section 13 or 15(d)

Accumulated other comprehensive income (loss) (Details)

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Accumulated other comprehensive income (loss) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Marketable securities    
Beginning balance   $ (12,563)
Gains (losses) on available for sale securities $ 0  
Less: Tax (tax benefit)   0
Net gains (losses) on available for sale securities 0  
(Gains) Losses reclassified from accumulated other comprehensive income to net income   12,563
Less: Tax (tax benefit) 0  
Net gains (losses) reclassified from accumulated other comprehensive income to net income   12,563
Other comprehensive income (loss), net of tax   $ 12,563
Ending balance $ 0