Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 15,660	$ 13,331
Restricted cash	25	25
Marketable securities	0	5,956
Ownership interests	0	860
Prepaid expenses and other current assets	593	1,251
Total current assets	16,278	21,423
Right-of-use asset, net	1,055	1,290
Ownership interests and advances	14,839	14,545
Other assets	255	434
Total Assets	32,427	37,692
Current Liabilities:
Accounts payable	103	16
Accrued compensation and benefits	204	507
Accrued expenses and other current liabilities	782	865
Lease liability - current	474	429
Total current liabilities	1,563	1,817
Lease liability - non-current	888	1,249
Other long-term liabilities	50	50
Total Liabilities	2,501	3,116
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 and outstanding at September 30, 2023 and December 31, 2022	2,157	2,157
Additional paid-in capital	801,124	804,752
Treasury stock, at cost; 5,063 and 5,478 shares at September 30, 2023 and December 31, 2022, respectively	(44,018)	(48,410)
Accumulated deficit	(729,312)	(723,898)
Accumulated other comprehensive loss	(25)	(25)
Total Equity	29,926	34,576
Total Liabilities and Equity	$ 32,427	$ 37,692