Note 13 - Revenues - Revenues (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 9,294,000	$ 9,744,000
Device [Member] | AXP [Member]
Revenues	5,138,000	4,934,000
Device [Member] | BioArchive [Member]
Revenues	2,345,000	2,032,000
Device [Member] | CAR-TXpress [Member]
Revenues	1,284,000	1,828,000
Device [Member] | Manual Disposables [Member]
Revenues	421,000	599,000
Device [Member] | Other Subsegments [Member]
Revenues	106,000	351,000
Device Revenue [Member]
Revenues	7,128,000	7,988,000
Device Revenue [Member] | Device [Member] | AXP [Member]
Revenues	4,940,000	4,774,000
Device Revenue [Member] | Device [Member] | BioArchive [Member]
Revenues	827,000	855,000
Device Revenue [Member] | Device [Member] | CAR-TXpress [Member]
Revenues	875,000	1,471,000
Device Revenue [Member] | Device [Member] | Manual Disposables [Member]
Revenues	421,000	599,000
Device Revenue [Member] | Device [Member] | Other Subsegments [Member]
Revenues	65,000	289,000
Service [Member]
Revenues	1,839,000	1,408,000
Service [Member] | Device [Member] | AXP [Member]
Revenues	198,000	160,000
Service [Member] | Device [Member] | BioArchive [Member]
Revenues	1,518,000	1,177,000
Service [Member] | Device [Member] | CAR-TXpress [Member]
Revenues	123,000	71,000
Other [Member]
Revenues	327,000	348,000
Other [Member] | Device [Member] | CAR-TXpress [Member]
Revenues	286,000	286,000
Other [Member] | Device [Member] | Other Subsegments [Member]
Revenues	$ 41,000	$ 62,000