Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 36,194	$ 10,640
Restricted cash	98	1,595
Accounts receivable, net	3,403	6,548
Inventories, net	194	97
Prepaid expenses and other current assets	1,555	2,193
Total current assets	41,444	21,073
Property and equipment, net of accumulated depreciation of $18,459 and $26,889, respectively	5,087	5,220
Goodwill	2,116	2,116
Other intangible assets, net of accumulated amortization of $828 and $757, respectively	516	553
Restricted cash	270	371
Right-of-use operating lease assets	311	394
Other assets	317	361
Total assets	50,061	30,088
Current liabilities:
Accounts payable	1,400	2,353
Accrued liabilities:
Operating lease liabilities - current	132	149
Employee compensation	681	930
Other accrued liabilities	1,339	2,099
Total current liabilities	3,552	5,531
Operating lease liabilities - non-current	171	237
Long-term borrowings	0	1,556
Deferred income taxes, net	134	134
Other liabilities	306	309
Total liabilities	4,163	7,767
Stockholders’ equity:
Common stock, $.01 par value, 40,000,000 shares authorized, 31,227,300 and 25,639,702 shares issued, and 30,263,791 and 25,228,951 shares outstanding, respectively	312	262
Additional paid-in capital	164,157	140,138
Accumulated deficit	(114,983)	(114,603)
Accumulated other comprehensive loss	(1,430)	(1,370)
Nil coupon perpetual loan notes	76	76
Treasury stock, at cost	(2,234)	(2,182)
Total stockholders’ equity	45,898	22,321
Total liabilities and stockholders’ equity	$ 50,061	$ 30,088