Note 8 - Revenue - Revenues (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net revenues	$ 2,115,000	$ 3,158,000	$ 7,807,000	$ 6,876,000
Device Revenue [Member]
Net revenues	1,595,000	2,662,000	6,329,000	5,190,000
Service [Member]
Net revenues	440,000	400,000	1,241,000	1,413,000
Other [Member]
Net revenues	80,000	96,000	237,000	273,000
Device [Member] | AXP [Member]
Net revenues	1,109,000	2,310,000	4,839,000	3,670,000
Device [Member] | AXP [Member] | Device Revenue [Member]
Net revenues	1,034,000	2,217,000	4,668,000	3,490,000
Device [Member] | AXP [Member] | Service [Member]
Net revenues	75,000	72,000	171,000	159,000
Device [Member] | AXP [Member] | Other [Member]
Net revenues		21,000		21,000
Device [Member] | BioArchive [Member]
Net revenues	522,000	518,000	1,618,000	1,817,000
Device [Member] | BioArchive [Member] | Device Revenue [Member]
Net revenues	201,000	221,000	694,000	652,000
Device [Member] | BioArchive [Member] | Service [Member]
Net revenues	321,000	297,000	924,000	1,165,000
Device [Member] | CAR-TXpress [Member]
Net revenues	306,000	262,000	911,000	1,005,000
Device [Member] | CAR-TXpress [Member] | Device Revenue [Member]
Net revenues	190,000	160,000	551,000	702,000
Device [Member] | CAR-TXpress [Member] | Service [Member]
Net revenues	44,000	31,000	146,000	89,000
Device [Member] | CAR-TXpress [Member] | Other [Member]
Net revenues	72,000	71,000	214,000	214,000
Device [Member] | Manual Disposables [Member]
Net revenues	150,000	55,000	357,000	300,000
Device [Member] | Manual Disposables [Member] | Device Revenue [Member]
Net revenues	150,000	55,000	357,000	300,000
Device [Member] | Other Subsegments [Member]
Net revenues	28,000	13,000	82,000	84,000
Device [Member] | Other Subsegments [Member] | Device Revenue [Member]
Net revenues	20,000	9,000	59,000	46,000
Device [Member] | Other Subsegments [Member] | Other [Member]
Net revenues	8,000	4,000	23,000	38,000
UNITED STATES
Net revenues	1,535,000	1,517,000	4,973,000	3,558,000
CHINA
Net revenues	364,000	1,357,000	1,570,000	1,445,000
THAILAND
Net revenues	2,000		10,000	400,000
All Other Countries [Member]
Net revenues	$ 214,000	$ 284,000	$ 1,254,000	$ 1,473,000