CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,909,605	$ 9,369,624
Short-term investments	6,247,265	13,573,057
Accounts receivable, net	8,275,518	6,770,838
Inventories	7,176,695	7,235,043
Other	1,075,170	571,527
Total current assets	43,684,253	37,520,089
Property, plant, and equipment, net	2,427,479	2,115,316
Goodwill	19,153,554	18,749,888
Other intangibles, net	7,362,144	9,482,578
Long-term investments	0	5,344,004
Equity method investment	1,871,360	0
Deferred tax assets and other	245,078	163,427
Total assets	74,743,868	73,375,302
Current liabilities:
Accounts payable	2,983,899	2,689,035
Income taxes payable	87,441	113,191
Accrued liabilities:
Compensation	4,171,976	4,670,640
Deferred revenue	774,635	597,524
Other	1,360,743	838,272
Total current liabilities	9,378,694	8,908,662
Accrued pension liability	264,692	308,918
Deferred rent	586,296	639,019
Other	478,347	278,780
Total liabilities	10,708,029	10,135,379
Commitments and contingencies
Shareholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; none issued or outstanding at December 31, 2017 and 2016, respectively	0	0
Common stock $.01 par value; 100,000,000 shares authorized, 60,905,666 and 60,436,548 shares issued and outstanding at December 31, 2017 and 2016, respectively.	609,059	604,368
Additional paid-in capital	145,982,121	144,430,381
Accumulated deficit	(81,999,901)	(81,005,654)
Accumulated other comprehensive loss	(555,440)	(789,172)
Total shareholders' equity	64,035,839	63,239,923
Total liabilities and shareholders' equity	$ 74,743,868	$ 73,375,302