Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Significant Accounting Policies [Abstract]

Reconciliation Of Cash, Cash Equivalents, And Restricted Cash Equivalents

	June 30, 2018		December 31, 2017
Cash and cash equivalents	$	4,689,826	$	5,485,631
Restricted cash equivalents		556,783		687,370
Restricted cash equivalents included in other property and investments		748,953		1,028,758
Total cash, cash equivalents and restricted cash equivalents shown in the consolidated statements of cash flows	$	5,995,562	$	7,201,759

Schedule Of Gains And Losses On Trading Securities

	Six months ended June 30, 2018		Six months ended June 30, 2017
Net gains and (losses) recognized during the period on trading securities	$	(181,257)	$	76,124
Less: Net gains and (losses) recognized during the period on trading securities sold during the period		(77,597)		0
Unrealized gains and (losses) recognized during the reporting period on trading securities still held at the reporting date	$	(103,660)	$	76,124