Statements Of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Operating Activities:
Net income (loss)	$ (1,624,000)	$ 51,089,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,148,000	694,000
Deferred income tax expense	92,000	5,545,000
Stock-based compensation	342,000	721,000
Changes in operating assets and liabilities:
Accounts receivable	(1,121,000)	564,000
Inventories	11,000	93,000
Income taxes receivable	(427,000)	(373,000)
Prepaid expenses and other	479,000	(489,000)
Accounts payable	(322,000)	109,000
Accrued liabilities	(858,000)	(172,000)
Income tax payable	(748,000)	3,117,000
Accrued income taxes	6,000	424,000
Excess tax benefit from stock options		(2,369,000)
Deferred revenue	311,000	(43,000)
Net cash provided by (used in) operating activities	(2,711,000)	58,910,000
Investing Activities:
Purchases of property and equipment	(138,000)	(2,195,000)
Acquisition of selling arrangement		(4,000,000)
Proceeds from sale of investments		500,000
Net cash used in investing activities	(138,000)	(5,695,000)
Financing Activities:
Excess tax benefit from stock options		2,369,000
Dividends paid		(31,335,000)
Proceeds from issuance of common stock, net	131,000	3,126,000
Repurchase of common stock, net	(213,000)	(17,369,000)
Net cash used in financing activities	(82,000)	(43,209,000)
Increase (decrease) in cash and cash equivalents	(2,931,000)	10,006,000
Cash and cash equivalents at beginning of period	23,202,000	13,196,000
Cash and cash equivalents at end of period	20,271,000	23,202,000
Supplemental disclosures for cash flow information:
Cash paid during the year for income taxes	835,000	21,762,000
Non-cash investing and financing activities:
Cashless exercise of options and warrants		$ 800,000