Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 12,274	$ 17,578
Short-term investments	8,162	12,136
Accounts receivable, less current expected credit loss of $106 and $111, respectively	9,202	6,729
Inventories, net	441	439
Prepaid expenses and other current assets	838	1,439
Total current assets	30,917	38,321
Property and equipment, net of accumulated depreciation of $18,926 and $18,703, respectively	4,596	4,539
Goodwill	2,116	2,116
Other intangible assets, net of accumulated amortization of $510 and $468, respectively	327	358
Right-of-use operating lease assets, net	523	609
Long-term investments	10,881	3,664
Other assets	757	781
Total assets	50,117	50,388
Current liabilities:
Accounts payable	3,271	2,421
Accrued liabilities:
Operating lease liabilities - current	81	81
Employee compensation	759	1,252
Other accrued liabilities	1,204	1,934
Total current liabilities	5,315	5,688
Operating lease liabilities - non-current	480	533
Deferred income taxes, net	172	172
Other liabilities	286	281
Total liabilities	6,253	6,674
Stockholders’ equity:
Common stock, $.01 par value, 40,000,000 shares authorized, 31,767,329 and 31,361,303 shares issued, and 30,708,273 and 30,385,297 shares outstanding, respectively	317	313
Additional paid-in capital	165,186	164,853
Accumulated deficit	(117,589)	(117,529)
Accumulated other comprehensive loss	(1,780)	(1,748)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost	(2,346)	(2,251)
Total stockholders’ equity	43,864	43,714
Total liabilities and stockholders’ equity	$ 50,117	$ 50,388