Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 3,405	$ 2,372
Accounts receivable, net of allowance for doubtful accounts of $248 and $245	1,479	1,262
Supplies	489	465
Prepaid expenses and other assets	183	138
Total current assets	5,556	4,237
Property and equipment, net	589	666
Investments in unconsolidated subsidiaries and other	211	211
Patents and licenses, net	49	66
Total assets	6,405	5,180
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts payable, accrued expenses and other	1,262	1,222
Current portion, capital lease obligations	226	253
Warrants, net of $0 and $280 in issuance costs	2,646	4,204
Total current liabilities	4,134	5,679
Capital lease obligations, net of current portion	188	226
Total liabilities	4,322	5,905
Commitments and contingencies (Notes 4 - 6)
Common stock; $0.001 par value; 25,000,000 shares authorized; 3,088,030 and 1,511,133 shares issued and outstanding	3	2
Additional paid-in capital	71,018	67,106
Accumulated net losses	(68,938)	(68,227)
Total stockholders' equity (deficit)	2,083	(1,119)
Total liabilities and stockholders' equity (deficit)	6,405	5,180
Series A Convertible Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Convertible preferred stock, net of issuance costs	0	394
Series B Convertible Preferred Stock [Member]
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Convertible preferred stock, net of issuance costs	$ 0	$ 0