Condensed Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities
Net earnings (loss)	$ (361,436)	$ (71,494)	$ 557,746
Adjustments to reconcile net earnings (loss) to net cash provided by operating activities
Depreciation and amortization	584,737	506,583	539,289
(Gain) loss on disposition of assets	0	(5,042)	23,071
Deferred income taxes	108,611	(51,385)	104,513
Share-based compensation	38,316	44,492	56,436
Casualty gain	(443,064)	0	0
Change in operating assets and liabilities
Accounts receivable	(291,646)	(92,541)	84,914
Inventories	1,375,057	(1,111,364)	6,310
Prepaid expenses and other current assets	(207,442)	182,676	84,785
Other assets	(4,303)	70,148	(84,722)
Accounts payable, trade	(632,973)	59,713	303,759
Accrued liabilities	44,412	92,584	49,773
Deferred revenue	235,083	500,927	(1,181,143)
Net cash provided by operating activities	445,352	125,297	544,731
Cash flows from investing activities
Purchase of property and equipment	(805,385)	(350,414)	(163,269)
Proceeds from insurance policy	625,247	0	0
Proceeds from sale of equipment	0	5,041	6,979
Net cash used in investing activities	(180,138)	(345,373)	(156,290)
Cash flows from financing activities
Exercise of common stock options	0	0	44,919
Payments of long-term obligations	(182,056)	(168,522)	(155,994)
Net cash used in financing activities	(182,056)	(168,522)	(111,075)
Effect of exchange rate changes on cash flows	(45,615)	26,990	(29,325)
Net increase (decrease) in cash and cash equivalents	37,543	(361,608)	248,041
Cash and cash equivalents at beginning of year	3,858,544	4,220,152	3,972,111
Cash and cash equivalents at end of year	3,896,087	3,858,544	4,220,152
Supplemental cash flow disclosures
Interest paid	127,509	141,043	153,572
Income taxes paid/(refunds received), net	$ (119,881)	$ (236,459)	$ 1,468