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Statements of Income (Unaudited) (Parentheticals) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Weighted Average Number of Shares Outstanding (in shares) 1,942,495 1,942,495 1,942,495 1,942,495