CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	[1]	$ 118,868	$ 33,325
Short-term investments in U.S. Treasury Bills		9,999	64,988
Investments in securities, at fair value		30,430	25,845
Receivable from brokers		4,344	5,833
Investment advisory fees receivable		23,034	28,796
Receivable from affiliates		3,824	4,882
Goodwill and identifiable intangible assets		3,176	3,176
Deferred tax asset and income tax receivable		9,292	9,462
Other assets		10,826	9,095
Total assets		213,793	185,402
LIABILITIES AND STOCKHOLDERS' EQUITY
Income taxes payable		11,383	3,910
Lease liability obligations		7,177	5,208
Compensation payable		29,302	21,543
Securities Sold, not yet purchased		0	799
Payable to affiliates		387	3,843
Accrued expenses and other liabilities		39,648	38,973
Sub-total		87,897	74,276
5.875% Senior Notes (net of issuance costs of $4 and $10, respectively) (due June 1, 2021) (Note 7)		24,221	24,215
Total liabilities		112,118	98,491
Commitments and contingencies (Note 10)
Stockholders' Equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized; none issued and outstanding		0	0
Additional paid-in capital		22,385	21,219
Retained earnings		409,788	394,386
Accumulated other comprehensive loss		(155)	(165)
Treasury stock, at cost (8,239,810 and 8,142,732 shares, respectively)		(330,376)	(328,562)
Total stockholders' equity		101,675	86,911
Total liabilities and stockholders' equity		213,793	185,402
Class A [Member]
Stockholders' Equity
Common stock		14	14
Class B [Member]
Stockholders' Equity
Common stock		$ 19	$ 19

[1] Includes U.S. Treasury Bills with maturities of three months or less when purchased of $108.0 million and $15.0 million at March 31, 2021 and December 31, 2020, respectively.