Accounts and Other Receivables (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 31, 2012

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

Accounts receivable, net consisted of the following:

	March 31,			December 31,
	2013			2012
Trade receivables	$	1,311,432		$	1,133,400
Other receivables		1,105,634			643,051
		2,417,066			1,776,451
Less allowance for doubtful accounts		(50,891	)		(42,709	)
	$	2,366,175		$	1,733,742

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 Doubtful Accounts [Table Text Block]

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

	Balance at		Charged to					Balance at
	Beginning of		Costs and					End of
	Period		Expenses		Deductions(1)			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
Year Ended December 31, 2010
Allowance for doubtful accounts	$	20,000	$	24,000	$	(8,000	)	$	36,000

(1) Reflects receivables written-off as uncollectible.