Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 15,134	$ 23,328
Short-term investments	12,855	2,981
Accounts receivable, net	6,781	7,729
Inventories, net	528	392
Prepaid expenses and other current assets	1,287	1,395
Total current assets	36,585	35,825
Property and equipment, net of accumulated depreciation of $18,651 and $18,557, respectively	4,368	4,435
Goodwill	2,116	2,116
Other intangible assets, net of accumulated amortization of $437 and $406, respectively	382	397
Right-of-use operating lease assets, net	495	197
Long-term investments	4,874	6,360
Other assets	789	794
Total assets	49,609	50,124
Current liabilities:
Accounts payable	3,097	2,710
Accrued liabilities:
Operating lease liabilities - current	107	125
Employee compensation	615	1,105
Other accrued liabilities	1,307	826
Total current liabilities	5,126	4,766
Operating lease liabilities - non-current	376	66
Deferred income taxes, net	177	177
Other liabilities	280	274
Total liabilities	5,959	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	164,651	164,422
Accumulated deficit	(117,449)	(115,991)
Accumulated other comprehensive loss	(1,690)	(1,728)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost	(2,251)	(2,251)
Total stockholders’ equity	43,650	44,841
Total liabilities and stockholders’ equity	$ 49,609	$ 50,124