Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Schedule Of Cost And Fair Value By Contractual Maturity) (Details)

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Marketable Securities (Schedule Of Cost And Fair Value By Contractual Maturity) (Details)
Mar. 31, 2018
USD ($)
Marketable Securities [Abstract]  
Less than 1 year, Cost Basis $ 11,978,760
1 to 5 years, Cost Basis 2,995,160
Total Marketable Securities, Cost Basis 14,973,920
Less than 1 year, Fair Value 11,921,344
1 to 5 years, Fair Value 2,963,200
Total Marketable Securities, Fair Value $ 14,884,544