Note 7 - Revenue - Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues	$ 2,663,000	$ 1,517,000
Device [Member] | AXP [Member]
Revenues	1,766,000	264,000
Device [Member] | BioArchive [Member]
Revenues	453,000	750,000
Device [Member] | CAR-TXpress [Member]
Revenues	313,000	354,000
Device [Member] | Manual Disposables [Member]
Revenues	105,000	129,000
Device [Member] | Other Subsegments [Member]
Revenues	26,000	20,000
Device Revenue [Member]
Revenues	2,187,000	824,000
Device Revenue [Member] | Device [Member] | AXP [Member]
Revenues	1,711,000	225,000
Device Revenue [Member] | Device [Member] | BioArchive [Member]
Revenues	155,000	208,000
Device Revenue [Member] | Device [Member] | CAR-TXpress [Member]
Revenues	199,000	255,000
Device Revenue [Member] | Device [Member] | Manual Disposables [Member]
Revenues	105,000	129,000
Device Revenue [Member] | Device [Member] | Other Subsegments [Member]
Revenues	17,000	7,000
Service [Member]
Revenues	396,000	609,000
Service [Member] | Device [Member] | AXP [Member]
Revenues	55,000	39,000
Service [Member] | Device [Member] | BioArchive [Member]
Revenues	298,000	542,000
Service [Member] | Device [Member] | CAR-TXpress [Member]
Revenues	43,000	28,000
Other [Member]
Revenues	80,000	84,000
Other [Member] | Device [Member] | CAR-TXpress [Member]
Revenues	71,000	71,000
Other [Member] | Device [Member] | Other Subsegments [Member]
Revenues	$ 9,000	$ 13,000