Note 8 - Noncontrolling Interest - Clyra Medical Common and Preferred Shares Outstanding (Details) - Clyra Medical Technology Inc [Member]	Mar. 31, 2019 shares
Shares, Outstanding (in shares)	66,845
Biolargo [Member]
Shares, Outstanding (in shares)	28,053
Percent	42.00%
Sanatio [Member]
Shares, Outstanding (in shares)	11,520	[1]
Percent	17.40%	[1]
Scion Solutions [Member]
Shares, Outstanding (in shares)	15,500	[2]
Percent	23.40%	[2]
Other [Member]
Shares, Outstanding (in shares)	11,772
Percent	17.20%

[1] Includes 9,830 Series A Preferred shares (see below), and 1,690 common shares.

[2] Does not include an additional 15,500 shares held in escrow subject to performance metrics.