Note 8 - Noncontrolling Interest - Clyra Medical Common and Preferred Shares Outstanding (Details) - Clyra Medical Technology Inc [Member]	Mar. 31, 2020 shares
Shares, Outstanding (in shares)	72,746	[1]
Biolargo [Member]
Shares, Outstanding (in shares)	26,203
Percent	36.00%
Sanatio [Member]
Shares, Outstanding (in shares)	15,064
Percent	21.00%
Scion Solutions [Member]
Shares, Outstanding (in shares)	15,500	[2]
Percent	21.00%	[2]
Other [Member]
Shares, Outstanding (in shares)	15,979
Percent	22.00%

[1] Does not include options to purchase 9,569 of shares of Clyra stock.

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