Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Cash Provided by Operating Activities	$ 2,653,307	$ 1,273,657
Cash Applied to Investing Activities:
Purchases of Available-for-Sale Securities	(16,398,003)	(8,641,014)
Maturity of Available-for-Sale Securities	13,443,636	8,642,053
Proceeds from Disposal of Property, Plant and Equipment	188,993	21,395
Purchase of Property, Plant and Equipment	(1,842,774)	(1,267,879)
Cash Paid for Investments	(3,333)	(1,030,000)
Cash Distributions from Equity and Other Investments	24,750	155,000
Net Cash Applied to Investing Activities	(4,586,731)	(2,120,445)
Cash Applied to Financing Activities:
Dividends Paid to Stockholders	(787,456)	(918,468)
Purchase of Treasury Stock	(22,937)	(79,485)
Total Cash Applied to Financing Activities	(810,393)	(997,953)
Net Change in Cash and Cash Equivalents	(2,743,817)	(1,844,741)
Cash and Cash Equivalents, Beginning of Period	8,071,854	13,937,215
Cash and Cash Equivalents, End of Period	$ 5,328,037	$ 12,092,474