Schedule II - Valuation and Qualifying Accounts:

12 Months Ended

Dec. 31, 2014

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Schedule II – Valuation and Qualifying Accounts:

The following is a summary of the allowance for doubtful accounts related to accounts receivable for the years ended December 31:

	2014		2013
Balance at beginning of year	$	217,000	$	99,000
Charged to expenses		67,000		138,000
Uncollectible accounts written off		(54,000)		(20,000)
Balance at end of year	$	230,000	$	217,000

The following is a summary of the allowance for excess inventory for the years ended December 31:

	2014		2013
Balance at beginning of year	$	738,000	$	636,000
Charged to expenses		(92,000)		101,000
Obsolete inventory written off		(1,000)		1,000
Balance at end of year	$	645,000	$	738,000

The following is a summary of property and equipment and the related accounts of accumulated depreciation for the years ended December 31:

	2014		2013
Cost Basis
Balance at beginning of year	$	38,400,335	$	36,571,114
Additions		817,636		1,829,221
Disposals		(399,960)		-
Balance at end of year	$	38,818,011	$	38,400,335
Accumulated depreciation
Balance at beginning of year	$	29,718,564	$	27,872,044
Depreciation		1,743,880		1,847,520
Disposals		(399,960)		-
Balance at end of year	$	31,062,484	$	29,718,564