CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Operating Lease, Liability, Current	$ 1,538	$ 1,432
Current Assets:
Cash and cash equivalents	52,421	52,449
Accounts receivable	15,563	18,429
Investments, at fair value	49,601	65,781
Income Taxes Receivable, Current	864	349
Other current assets	3,622	2,731
Total current assets	122,071	139,739
Long-term Investments	5,675	5,425
Goodwill	19,804	19,804
Deferred income taxes	4,838	5,102
Operating Lease, Right-of-Use Asset	8,472	8,698
Intangible assets, net	15,549	15,961
Property and equipment, net of accumulated depreciation of $6,689 and $6,462	4,740	4,454
Total assets	181,149	199,183
Current liabilities:
Accounts payable and accrued liabilities	2,672	2,518
Dividends payable	7,232	7,710
Compensation and benefits payable	2,646	15,102
Income taxes payable	1,254	365
Total current liabilities	15,342	27,127
Accrued dividends	748	1,576
Operating Lease, Liability, Noncurrent	8,949	9,331
Total liabilities	25,039	38,034
Commitments and contingencies
Stockholders' Equity:
Common stock, $0.01 par value, authorized 25,000,000 shares, issued 10,340,629 and outstanding 8,975,865 shares at March 31, 2019; issued 10,182,583 and outstanding 8,904,902 shares at December 31, 2018	104	102
Additional paid-in capital	197,598	194,116
Treasury stock, at cost - 1,364,764 shares at March 31, 2019; 1,277,681 shares at December 31, 2018	(62,077)	(58,711)
Foreign currency translation adjustment	(4,052)	(4,883)
Retained earnings	24,537	30,525
Total stockholders' equity	156,110	161,149
Total liabilities and stockholders' equity	$ 181,149	$ 199,183