Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 13,607	$ 25,028
Restricted cash	25	25
Prepaid expenses and other current assets	544	1,297
Total current assets	14,176	26,350
Property and equipment, net	1,949	2,101
Ownership interests in and advances	61,405	77,129
Other assets	1,996	1,997
Total Assets	79,526	107,577
Current Liabilities:
Accounts payable	39	39
Accrued compensation and benefits	1,106	1,364
Accrued expenses and other current liabilities	567	627
Lease liability - current	360	399
Total current liabilities	2,072	2,429
Lease liability - non-current	2,222	2,380
Other long-term liabilities	918	1,027
Total Liabilities	5,212	5,836
Commitments and contingencies (Note 9)
Equity:
Preferred stock, $0.10 par value; 1,000 shares authorized
Common stock, $0.10 par value; 83,333 shares authorized; 21,573 shares issued at June 30, 2020 and December 31, 2019	2,157	2,157
Additional paid-in capital	809,255	810,856
Treasury stock, at cost; 810 and 930 shares at June 30, 2020 and December 31, 2019, respectively	(12,130)	(14,024)
Accumulated deficit	(724,943)	(697,223)
Accumulated other comprehensive loss	(25)	(25)
Total Equity	74,314	101,741
Total Liabilities and Equity	$ 79,526	$ 107,577