Receivables (Tables)

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

Accounts and royalties receivable, net consisted of the following:

	December 31, 2012			December 31, 2011
Trade receivables	$	1,133,400		$	904,891
Other receivables		643,051			613,806
		1,776,451			1,518,697
Less allowance for doubtful accounts		(42,709	)		(38,234	)
	$	1,733,742		$	1,480,463

Schedule Of Change In Allowance For Doubtfull Accounts [Table Text Block]

The following table reflects the approximate change in allowance for doubtful accounts.

	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions(1)			Balance at End of Period
Year Ended December 31, 2012
Allowance for doubtful accounts	$	38,000	$	43,000	$	(38,000	)	$	43,000
Year Ended December 31, 2011
Allowance for doubtful accounts	$	36,000	$	36,000	$	(34,000	)	$	38,000

(1) Reflects receivables written-off as uncollectible.