Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 4,183,980	$ 3,537,875
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	140,911	181,916
Realized (gain) loss on sale of marketable securities	(13,439)	39,214
Realized (gain) on sale of assets	0	(2,750)
(Decrease) increase in cash resulting from changes in operating assets and liabilities:
Accounts receivable	(1,358,427)	170,899
Receivable from damage settlement	420,440	0
Inventories	121,159	343,184
Prepaid expenses and other current and non-current assets	28,237	59,395
Prepaid taxes	3,602	78,613
Accounts payable	(15,290)	(236,926)
Accrued expenses and taxes payable	127,937	96,623
Net cash provided by operating activities	3,639,110	4,268,043
Cash flows from investing activities:
Acquisition of property, plant and equipment	(235,062)	(121,992)
Proceeds from sale of assets	0	2,750
Proceeds from sale of marketable securities	1,719,983	1,716,244
Purchases of marketable securities	(2,776,337)	(3,329,913)
Net cash used in investing activities	(1,291,416)	(1,732,911)
Cash flows from financing activities:
Dividends paid	(2,160,326)	(1,930,504)
Net cash used in financing activities	(2,160,326)	(1,930,504)
Net increase in cash and cash equivalents	187,368	604,628
Cash and cash equivalents at beginning of period	1,748,382	1,090,974
Cash and cash equivalents at end of period	$ 1,935,750	$ 1,695,602