Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities:
Net income	$ 51,089,000	$ 6,596,000	$ 3,716,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	694,000	339,000	405,000
Deferred income tax expense (benefit)	5,545,000	(5,702,000)
Stock-based compensation	721,000	711,000	537,000
Changes in operating assets and liabilities:
Accounts receivable	564,000	(337,000)	(123,000)
Inventories	93,000	(25,000)	53,000
Prepaid expenses and other	(862,000)	(151,000)	(158,000)
Accounts payable	109,000	82,000	(496,000)
Accrued liabilities	(172,000)	297,000	(1,417,000)
Income tax payable	3,117,000
Accrued income taxes	424,000
Excess tax benefit from stock options	(2,369,000)
Deferred revenue	(43,000)	(971,000)	(53,000)
Net cash provided by operating activities	58,910,000	839,000	2,464,000
Investing Activities:
Purchases of property and equipment	(2,195,000)	(387,000)	(278,000)
Acquisition of selling arrangement	(4,000,000)
Purchases of investments		(3,800,000)	(6,300,000)
Proceeds from sale of investments	500,000	7,700,000	1,900,000
Net cash provided by (used in) investing activities	(5,695,000)	3,513,000	(4,678,000)
Financing Activities:
Payment of long-term liabilities		(219,000)	(202,000)
Excess tax benefit from stock options	2,369,000
Dividends paid	(31,335,000)
Proceeds from issuance of common stock, net	3,126,000	735,000	161,000
Repurchase of common stock, net	(17,369,000)	(469,000)
Net cash provided by (used in) financing activities	(43,209,000)	47,000	(41,000)
Increase (decrease) in cash and cash equivalents	10,006,000	4,399,000	(2,255,000)
Cash and cash equivalents at beginning of year	13,196,000	8,797,000	11,052,000
Cash and cash equivalents at end of year	23,202,000	13,196,000	8,797,000
Supplemental disclosures for cash flow information:
Cash paid during the year for income taxes	21,762,000	62,000	67,000
Cash paid during the year for interest		110,000	72,000
Non-cash investing and financing activities:
Cashless exercise of options and warrants	$ 800,000	$ 3,363,000