Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 10,589	$ 8,510
Short-term investments	12,420	10,184
Accounts receivable, less current expected credit loss of $108 and $106, respectively	6,293	9,368
Inventories, net	616	397
Prepaid expenses and other current assets	1,093	1,160
Total current assets	31,011	29,619
Property and equipment, net of accumulated depreciation of $19,155 and $18,958, respectively	4,853	5,084
Goodwill	2,116	2,116
Other intangible assets, net of accumulated amortization of $543 and $525, respectively	315	327
Right-of-use operating lease assets, net	578	585
Long-term investments	7,925	10,875
Other assets	205	191
Total assets	47,003	48,797
Current liabilities:
Accounts payable	2,124	2,915
Accrued liabilities:
Operating lease liabilities - current	84	77
Employee compensation	743	1,248
Other accrued liabilities	2,375	1,615
Total current liabilities	5,326	5,855
Operating lease liabilities - non-current	536	548
Deferred income taxes, net	176	176
Other liabilities	301	263
Total liabilities	6,339	6,842
Stockholders’ equity:
Common stock, $.01 par value, 40,000,000 shares authorized, 32,281,179 and 31,767,329 shares issued, and 31,074,438 and 30,708,273 shares outstanding, respectively	322	317
Additional paid-in capital	165,503	165,295
Accumulated deficit	(120,900)	(119,472)
Accumulated other comprehensive loss	(1,769)	(1,915)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost	(2,568)	(2,346)
Total stockholders’ equity	40,664	41,955
Total liabilities and stockholders’ equity	$ 47,003	$ 48,797