CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 2,380,663	$ 8,425,846
Marketable securities, current	6,308,007	4,304,912
Trade accounts receivable, less allowance for doubtful accounts of $208,360 in 2012 and $150,921 in 2011	7,693,630	4,675,464
Other receivables	339,513	101,951
Inventories	6,525,232	4,479,929
Prepaid income taxes	326,690	9,239
Prepaid expenses, other	630,567	511,299
Deferred income taxes	870,985	848,597
Total current assets	25,075,287	23,357,237
Marketable securities, noncurrent	456,801	5,799,417
Property, plant and equipment, net of accumulated depreciation of $6,777,754 in 2012 and $4,147,129 in 2011	5,187,802	3,174,748
Goodwill	8,529,863	3,119,246
Investment in affiliated company	3,215,000	3,237,250
Intangible assets, net	12,293,015	909,536
Other assets	292,074	107,077
TOTAL ASSETS	55,049,842	39,704,511
Current liabilities:
Current maturities of long-term notes payable	2,457,497
Revolving line of credit	4,541,459
Accounts payable	2,476,008	1,812,779
Compensation and related expenses	2,920,415	2,313,553
Other accrued expenses	803,772	406,378
Accrued product warranties	257,940	205,506
Dividends payable	575,672	543,881
Deferred revenue	493,162	857,906
Total current liabilities	14,525,925	6,140,003
Notes payable	4,872,985
Deferred income taxes	2,586,923
Obligations to former employees	73,323	46,751
Accrued income taxes	273,600	277,978
Total liabilities	22,332,756	6,464,732
Stockholders' equity:
Capital stock - undesignated. Authorized 3,000,000 shares; none issued and outstanding in 2012 and 2011
Common stock - $0.10 par value. Authorized 22,000,000 shares; issued and outstanding 5,482,588 shares in 2012 and 5,438,810 shares in 2011	548,259	543,881
Additional paid-in capital	3,516,926	2,762,524
Retained earnings	29,969,426	30,523,405
Accumulated other comprehensive loss	(1,317,525)	(590,031)
Total stockholders' equity	32,717,086	33,239,779
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 55,049,842	$ 39,704,511