Consolidated Statements of Stockholders Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated other comprehensive income (loss) [Member]	Total
Balance at Dec. 31, 2008	$ 184,794	$ 205,306,957	$ (5,596,710)	$ (52,547,173)	$ (542,443)	$ 146,805,425
Balance (in shares) at Dec. 31, 2008	18,479,345
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	(10,459,034)	0	(10,459,034)
Issuance of stock for employer 401(k) matching contribution	417	406,110	136,552	0	0	543,079
Issuance of stock for employer 401(k) matching contribution (in shares)	41,700
Tax benefit from the exercise of stock options	0	436,828	0	0	0	436,828
Exercise of stock options, warrants, and SARs	0	(571,736)	723,633	0	0	151,897
Issuance of fully vested restricted common stock	0	(4,995,015)	4,995,015	0	0	0
Stock-based compensation expense	0	7,068,273	0	0	0	7,068,273
Expiration of stock compensation deferred tax asset	0	(910,925)	0	0	0	(910,925)
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	380,910	380,910
Currency translation adjustment	0	0	0	0	(130,764)	(130,764)
Treasury stock buyback	0	0	(258,490)	0	0	(258,490)
Balance at Dec. 31, 2009	185,211	206,740,492	0	(63,006,207)	(292,297)	143,627,199
Balance (in shares) at Dec. 31, 2009	18,521,045
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	(8,774,956)	0	(8,774,956)
Issuance of stock for employer 401(k) matching contribution	390	573,190	0	0	0	573,580
Issuance of stock for employer 401(k) matching contribution (in shares)	38,993
Tax benefit from the exercise of stock options	0	164,969	0	0	0	164,969
Exercise of stock options, warrants, and SARs	585	101,769	0	0	0	102,354
Exercise of stock options, warrants, and SARs (in shares)	58,511
Issuance of restricted stock awards	3,070	(3,070)	0	0	0	0
Issuance of restricted stock awards (in shares)	307,000
Stock-based compensation expense	0	3,799,031	0	0	0	3,799,031
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	(54,795)	(54,795)
Currency translation adjustment	0	0	0	0	(143,714)	(143,714)
Balance at Dec. 31, 2010	189,256	211,376,381	0	(71,781,163)	(490,806)	139,293,668
Balance (in shares) at Dec. 31, 2010	18,925,549
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	7,428,429	0	7,428,429
Issuance of stock for employer 401(k) matching contribution	693	649,434	0	0	0	650,127
Issuance of stock for employer 401(k) matching contribution (in shares)	69,276
Tax benefit from the exercise of stock options	0	3,237,219	0	0	0	3,237,219
Exercise of stock options, warrants, and SARs	1,081	163,528	0	0	0	164,609
Exercise of stock options, warrants, and SARs (in shares)	108,169
Issuance of restricted stock awards	4,703	(4,703)	0	0	0	0
Issuance of restricted stock awards (in shares)	470,250
Stock-based compensation expense	0	3,640,185	0	0	0	3,640,185
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	69,190	69,190
Currency translation adjustment	0	0	0	0	157,767	157,767
Balance at Dec. 31, 2011	$ 195,733	$ 219,062,044	$ 0	$ (64,352,734)	$ (263,849)	$ 154,641,193
Balance (in shares) at Dec. 31, 2011	19,573,244