Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 13,483	$ 23,328
Short-term investments	14,802	2,981
Accounts receivable, net	7,696	7,729
Inventories, net	325	392
Prepaid expenses and other current assets	1,041	1,395
Total current assets	37,347	35,825
Property and equipment, net of accumulated depreciation of $18,727 and $18,557, respectively	4,364	4,435
Goodwill	2,116	2,116
Other intangible assets, net of accumulated amortization of $452 and $406, respectively	376	397
Right-of-use operating lease assets, net	462	197
Long-term investments	4,883	6,360
Other assets	771	794
Total assets	50,319	50,124
Current liabilities:
Accounts payable	2,872	2,710
Accrued liabilities:
Operating lease liabilities - current	103	125
Employee compensation	618	1,105
Other accrued liabilities	1,838	826
Total current liabilities	5,431	4,766
Operating lease liabilities - non-current	348	66
Deferred income taxes, net	177	177
Other liabilities	275	274
Total liabilities	6,231	5,283
Stockholders’ equity:
Common stock, $.01 par value, 40,000,000 shares authorized, 31,361,303 and 31,272,303 shares issued, and 30,385,297 and 30,296,297 shares outstanding, respectively	313	313
Additional paid-in capital	164,752	164,422
Accumulated deficit	(116,990)	(115,991)
Accumulated other comprehensive loss	(1,812)	(1,728)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost	(2,251)	(2,251)
Total stockholders’ equity	44,088	44,841
Total liabilities and stockholders’ equity	$ 50,319	$ 50,124