Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 3,340,991	$ 3,896,087
Accounts receivable, net of allowance for doubtful accounts of $30,137 and $29,361, respectively	802,073	877,275
Inventories	4,792,855	5,084,900
Deferred income taxes	451,584	462,088
Prepaid expenses and other current assets	1,255,164	833,458
Total current assets	10,642,667	11,153,808
Property and equipment, net	4,341,304	4,488,374
Goodwill, net	2,286,535	2,298,020
Intangible assets, net	42,447	43,936
Other assets	29,551	30,283
Total assets	17,342,504	18,014,421
Current liabilities:
Accounts payable, trade	1,562,444	1,495,194
Accrued liabilities	1,147,594	1,111,131
Current maturities of long-term obligations	200,513	196,678
Deferred revenue	2,516,476	3,230,506
Total current liabilities	5,427,027	6,033,509
Long-term obligations, less current maturities	1,297,231	1,348,821
Deferred income taxes	1,083,715	1,116,593
Shareholders' equity:
Common stock, $0.001 par value; 50,000,000 shares authorized; 22,228,834 shares issued and outstanding at June 30, 2012 and December 31, 2011	22,229	22,229
Additional paid-in capital	13,693,439	13,688,730
Accumulated deficit	(4,321,953)	(4,314,278)
Accumulated other comprehensive income	140,816	118,817
Total shareholders' equity	9,534,531	9,515,498
Total liabilities and shareholders' equity	$ 17,342,504	$ 18,014,421