Condensed Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Condensed Statements Of Cash Flows
Net Cash Provided by Operating Activities	$ 4,495,830	$ 4,980,261
Cash Flows Applied to Investing Activities:
Purchases of Available-for-Sale Securities	(12,893,876)	(14,055,338)
Maturity of Available-for-Sale Securities	13,138,811	14,050,785
Proceeds from Disposal of Property	303,648	15,815
Purchase of Property, Plant and Equipment	(2,820,443)	(1,755,686)
Cash Distribution from Investment	3,000	2,350
Net Cash Applied to Investing Activities	(2,268,860)	(1,742,074)
Cash Flows Applied to Financing Activities:
Dividends Paid to Stockholders	(1,572,572)	(1,547,117)
Purchase of Treasury Stock	(24,640)	(32,000)
Total Cash Applied to Financing Activities	(1,597,212)	(1,579,117)
Net Change in Cash and Cash Equivalents	629,758	1,659,070
Cash and Cash Equivalents, Beginning of Period	2,940,967	1,051,141
Cash and Cash Equivalents, End of Period	$ 3,570,725	$ 2,710,211