Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 21,750	$ 15,601
Restricted cash	25	0
Prepaid expenses and other current assets	588	462
Total current assets	22,363	16,063
Property and equipment, net	1,736	1,790
Ownership interests and advances	62,593	50,398
Other assets	292	784
Total Assets	86,984	69,035
Current Liabilities:
Accounts payable	18	56
Accrued compensation and benefits	3,045	2,677
Accrued expenses and other current liabilities	577	410
Lease liability - current	338	327
Total current liabilities	3,978	3,470
Lease liability - non-current	1,964	2,053
Other long-term liabilities	50	637
Total Liabilities	5,992	6,160
Commitments and contingencies (Note 9)
Equity:
Preferred stock, $0.10 par value; 1,000 shares authorized	0	0
Common stock, $0.10 par value; 83,333 shares authorized; 21,573 shares issued at March 31, 2021 and December 31, 2020	2,157	2,157
Additional paid-in capital	807,111	807,582
Treasury stock, at cost; 630 and 688 shares at March 31, 2021 and December 31, 2020, respectively	(9,237)	(10,200)
Accumulated deficit	(719,014)	(736,639)
Accumulated other comprehensive loss	(25)	(25)
Total Equity	80,992	62,875
Total Liabilities and Equity	$ 86,984	$ 69,035