Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,007	$ 2,372
Accounts receivable, net of allowance for doubtful accounts of $225 and $245	1,429	1,262
Supplies	416	465
Prepaid expenses and other assets	253	138
Total current assets	6,105	4,237
Property and equipment, net	695	666
Investments in unconsolidated subsidiaries and other	211	211
Patents and licenses, net	16	66
Total assets	7,027	5,180
Current liabilities:
Accounts payable, accrued expenses and other	1,258	1,222
Current portion, capital lease obligations	188	253
Warrants, net of $0 and $279 in issuance costs	1,090	4,204
Total current liabilities	2,536	5,679
Capital lease obligations, net of current portion	99	226
Total liabilities	2,635	5,905
Commitments and contingencies (Note 5)
Stockholders' equity (deficit):
Common stock; $0.001 par value; 25 million shares authorized; 4,737,807 and 1,511,133 shares issued and outstanding	5	2
Additional paid-in capital	76,039	67,106
Accumulated net losses	(71,652)	(68,227)
Total stockholders' equity (deficit	4,392	(1,119)
Total liabilities and stockholders' equity (deficit	7,027	5,180
Convertible Preferred Stock [Member]
Convertible preferred stock; $0.001 par value; 5 million shares authorized;
Convertible preferred stock	0	394
Series B Convertible Preferred Stock [Member]
Convertible preferred stock; $0.001 par value; 5 million shares authorized;
Convertible preferred stock	0	0
Series C Convertible Preferred Stock [Member]
Convertible preferred stock; $0.001 par value; 5 million shares authorized;
Convertible preferred stock	$ 0	$ 0