Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 4,716,530	$ 3,799,692
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	255,583	229,777
Net gain on sale of assets	(18,251)
Realized loss (gain) on sales of marketable securities	8,765	(39,958)
Realized loss on pension termination		338,655
Reduction in allowance for bad debts	(5,092)	(4,678)
Deferred income taxes	40,999	82,807
(Decrease) increase in cash resulting from changes in operating assets and liabilities:
Accounts receivable	(557,636)	278,853
Inventories	(146,045)	(168,255)
Prepaid expenses and other current and non-current assets	89,168	(59,000)
Accounts payable	192,145	(114,082)
Accrued expenses and taxes payable	(139,037)	(141,601)
Pension liability		(108,892)
Net cash provided by operating activities	4,437,129	4,093,318
Cash flows from investing activities:
Acquisitions of plant and equipment	(274,645)	(454,554)
Proceeds from the sale of assets	38,658
Purchases of marketable securities	(3,987,606)	(6,323,425)
Proceeds from sales of marketable securities	3,040,000	6,509,428
Net change in certificates of deposit		1,014,866
Net cash (used in) provided by investing activities	(1,183,593)	746,315
Cash flows from financing activities:
Acquisition of treasury stock		(3,762,500)
Dividends paid	(3,677,151)	(4,583,617)
Net cash used in financing activities	(3,677,151)	(8,346,117)
Net decrease in cash and cash equivalents	(423,615)	(3,506,484)
Cash and cash equivalents, beginning of year	1,514,589	5,021,073
Cash and cash equivalents, end of year	$ 1,090,974	$ 1,514,589