Note 2 - Summary of Significant Accounting Policies - Revenues (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Jun. 30, 2017
Net revenues	$ 6,013,000	$ 9,672,000	$ 14,525,000
Device [Member]
Net revenues		9,469,000
Device [Member] | AXP [Member]
Net revenues		4,393,000
Device [Member] | BioArchive [Member]
Net revenues		3,098,000
Device [Member] | Manual Disposables [Member]
Net revenues		976,000
Device [Member] | CAR-TXpress [Member]
Net revenues		907,000
Device [Member] | Other Subsegments [Member]
Net revenues		95,000
Clinical Development [Member]
Net revenues		203,000
Clinical Development [Member] | Other Subsegments [Member]
Net revenues		68,000
Clinical Development [Member] | Bone Marrow [Member]
Net revenues		135,000
Device Revenue [Member]
Net revenues		7,844,000
Device Revenue [Member] | Device [Member]
Net revenues		7,806,000
Device Revenue [Member] | Device [Member] | AXP [Member]
Net revenues		4,131,000
Device Revenue [Member] | Device [Member] | BioArchive [Member]
Net revenues		1,792,000
Device Revenue [Member] | Device [Member] | Manual Disposables [Member]
Net revenues		976,000
Device Revenue [Member] | Device [Member] | CAR-TXpress [Member]
Net revenues		907,000
Device Revenue [Member] | Device [Member] | Other Subsegments [Member]
Net revenues
Device Revenue [Member] | Clinical Development [Member]
Net revenues		38,000
Device Revenue [Member] | Clinical Development [Member] | Other Subsegments [Member]
Net revenues		38,000
Device Revenue [Member] | Clinical Development [Member] | Bone Marrow [Member]
Net revenues
Service [Member]
Net revenues		1,733,000
Service [Member] | Device [Member]
Net revenues		1,568,000
Service [Member] | Device [Member] | AXP [Member]
Net revenues		262,000
Service [Member] | Device [Member] | BioArchive [Member]
Net revenues		1,306,000
Service [Member] | Device [Member] | Manual Disposables [Member]
Net revenues
Service [Member] | Device [Member] | CAR-TXpress [Member]
Net revenues
Service [Member] | Device [Member] | Other Subsegments [Member]
Net revenues
Service [Member] | Clinical Development [Member]
Net revenues		165,000
Service [Member] | Clinical Development [Member] | Other Subsegments [Member]
Net revenues		30,000
Service [Member] | Clinical Development [Member] | Bone Marrow [Member]
Net revenues		135,000
Other [Member]
Net revenues		95,000
Other [Member] | Device [Member]
Net revenues		95,000
Other [Member] | Device [Member] | AXP [Member]
Net revenues
Other [Member] | Device [Member] | BioArchive [Member]
Net revenues
Other [Member] | Device [Member] | Manual Disposables [Member]
Net revenues
Other [Member] | Device [Member] | CAR-TXpress [Member]
Net revenues
Other [Member] | Device [Member] | Other Subsegments [Member]
Net revenues		95,000
Other [Member] | Clinical Development [Member]
Net revenues
Other [Member] | Clinical Development [Member] | Other Subsegments [Member]
Net revenues
Other [Member] | Clinical Development [Member] | Bone Marrow [Member]
Net revenues