Note 9 - Equity (Tables)

12 Months Ended

Dec. 31, 2025

Notes Tables

Schedule of Stock by Class [Table Text Block]

Date of Purchase	Shares Purchased		Gross Proceeds		Net Proceeds		Original Conversion Price		Series F Outstanding December 31, 2023		Issuances		Series F Converted			Shares Outstanding December 31, 2024		Conversion Price December 31, 2024		Shares Issuable December 31, 2024
March 9, 2023		3,000		3,000,000		3,000,000		420.00		3,000		-		(3,000	)		—	$	1.1000		-
November 15, 2023		1,850		1,850,000		1,850,000		124.70		1,850		-		(1,700	)		150		1.1000		136,364
		4,850	$	4,850,000	$	4,850,000		—		4,850		-		(4,700	)		150		—		136,364
March 6, 2024		1,000		1,000,000		950,000		60.29		—		1,000		(565	)		435		1.1000		395,455
April 12, 2024		1,050		1,050,000		1,050,000		37.00		—		1,050		—			1,050		1.1000		954,545
May 31, 2024		1,050		1,050,000		1,025,000		32.15		—		1,050		—			1,050		1.1000		954,545
July 25, 2024		500		500,000		500,000		23.15		—		500		—			500		1.1000		454,545
August 27, 2024		500		500,000		500,000		20.19		—		500		—			500		1.1000		454,545
October 1, 2024 (i)		1,500		—		—		12.00		—		1,500		—			1500		1.1000		1,363,636
December 18, 2024		750		750,000		750,000		5.25		—		750		—			750		5.2500		142,857
2024 Activity		6,350	$	4,850,000	$	4,775,000		—		—		6,350		(565	)		5,785		—		4,720,128
		11,200	$	9,700,000	$	9,625,000				4,850		6,350		(5,265	)		5,935				4,856,492
Date of Purchase	Shares Purchased		Gross Proceeds		Net Proceeds		Original Conversion Price		Series F Outstanding December 31, 2024		Issuances		Series F Converted			Shares Outstanding December 31, 2025		Conversion Price December 31, 2025		Shares Issuable December 31, 2025
November 15, 2023		1,850		1,850,000		1,850,000	$	124.70		150		—		—			150	$	0.8294		180,854
March 6, 2024		1,000		1,000,000		950,000		60.29		435		—		(335	)		100		0.8294		120,569
April 12, 2024		1,050		1,050,000		1,050,000		37.00		1,050		—		(1,050	)		—		0.8294		—
May 31, 2024		1,050		1,050,000		1,025,000		32.15		1,050		—		(915	)		135		0.8294		162,768
July 25, 2024		500		500,000		500,000		23.15		500		—		(500	)		—		0.8294		—
August 27, 2024		500		500,000		500,000		20.19		500		—		(500	)		—		0.8294		—
October 1, 2024 (i)		1,500		—		—		12.00		1,500		—		(1,500	)		—		0.8294		—
December 18, 2024		750		750,000		750,000		5.25		750		—		(750	)		—		0.8294		—
		8,200	$	6,700,000	$	6,625,000		—		5,935		—		(5,550	)		385		—		464,191
February 7, 2025		1,000		1,000,000		1,000,000		2.2203		—		1,000		(1,000	)		—		0.8294		—
March 17, 2025		500		500,000		500,000		1.2036		—		500		(500	)		—		0.8294		—
May 5, 2025		500		500,000		500,000		0.8294		—		500		(500	)		—		0.8294		—
June 6, 2025		500		500,000		500,000		1.1938		—		500		(500	)		—		1.1938		—
June 9, 2025		1,000		1,000,000		1,000,000		1.1928		—		1,000		(1,000	)		—		1.1928		—
June 17, 2025		1,000		1,000,000		1,000,000		1.2546		—		1,000		(1,000	)		—		1.2546		—
July 11, 2025		800		800,000		800,000		1.1908		—		800		(800	)		—		1.1908		—
July 18, 2025		1,000		1,000,000		1,000,000		1.4000		—		1,000		(578	)		422		0.9615		438,898
July 21, 2025		500		500,000		500,000		1.4000		—		500		—			500		0.9615		520,021
July 24, 2025		1,000		1,000,000		1,000,000		2.1900		—		1,000		—			1,000		0.9615		1,040,042
August 22, 2025		500		500,000		500,000		1.8149		—		500		(500	)		—		0.9615		—
September 19, 2025		500		500,000		500,000		1.8342		—		500		(500	)		—		0.9615		—
October 3, 2025		2,000		2,000,000		2,000,000		2.0679		—		2,000		(2,000	)		—		0.9615		—
October 6, 2025		1,000		1,000,000		1,000,000		2.3427		—		1,000		(185	)		815		0.9615		847,634
November 24, 2025		500		500,000		500,000		1.1347		—		500		—			500		0.9615		520,021
December 22, 2025		500		500,000		500,000		0.9615		—		500		—			500		0.9615		520,021
Total 2025 Activity		12,800	$	12,800,000	$	12,800,000		—		—		12,800		(9,063	)		3,737		-		3,886,636
Grand Total Activity		21,000	$	19,500,000	$	19,425,000		-		5,935		12,800		(14,613	)		4,122		-		4,350,827

Date of Purchase	Shares Purchased		Gross Proceeds		Net Proceeds		Original Conversion Price		Series F Outstanding December 31, 2024		Issuances		Series F Converted			Shares Outstanding December 31, 2025		Conversion Price December 31, 2025		Shares Issuable December 31, 2025
November 10, 2025		12,000	$	12,000,000	$	-	$	1.2300		-		12,000		(5,810	)		6,190	$	0.9615		6,437,858
		12,000	$	12,000,000	$	-		—		-		12,000		(5,810	)		6,190	$	0.9615		6,437,858

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	December 31, 2025			December 31, 2024			October 1, 2024 (Issuance)
Exercise price	$	—		$	1.9445		$12.00 - $25.00
Stock price	$	0.8138		$	3.4700		$	7.9100
Expected term (year)		3.75			4.75			5.00
Volatility		140.18	%		133.00	%		108.00	%
Risk-free rate		3.64	%		4.28	%		3.45	%
Dividend yield		—	%		—	%		—	%
Probability of capital raise below exercise price		100	%		100	%		100	%

Schedule of Dividends Payable [Table Text Block]

Deemed Dividends on Series F and G Preferred Stock
Date of Trigger Event	Description of Trigger Event	Series F & G Shares Triggered		Conversion Prices Prior to Trigger		Conversion Price After Trigger		Incremental Value Deemed Dividend
March 17, 2025	March 2025 Down Round Trigger		5,025	$	2.2203 - 5.2500	$	1.2000	$	976,637
May 5, 2025	May 2025 Down Round Trigger		4,317	$	1.1000 - 1.2036	$	0.8294		1,105,871
July 11, 2025	July 2025 Down Round Trigger		1,900		$1.1938 - $1.2546	$	1.1908		55,202
August 22, 2025	August 2025 Down Round Trigger		1,000	$	2.1900	$	1.8149		130,710
November 24, 2025	November 2025 Down Round Trigger		11,698	$	2.3427 - 1.2300	$	1.1347		1,257,184
December 22, 2025	December 2025 Down Round Trigger		9,427	$	1.1347	$	0.9615		1,097,536
	Deemed Dividends on Series F							$	4,623,140

Deemed Dividends on Series F Warrants
Date of Trigger Event	Description of Trigger Event	Series F Warrants Triggered		Conversion Prices Prior to Trigger		Conversion Price After Trigger		Incremental Value Deemed Dividend
March 17, 2025	March 2025 Down Round Trigger		1,045,402	$	2.22 - 2.25	$	1.2000	$	79,695
May 5, 2025	May 2025 Down Round Trigger		1,551,243	$	1.10		0.8294		36,504
July 11, 2025	July 2025 Down Round Trigger		1,551,243	$	1.19 - 1.25		1.1908		6,555
August 22, 2025	August 2025 Down Round Trigger		456,621	$	2.19		1.8149		16,059
December 22, 2025	December 2025 Down Round Trigger		4,232,630	$	1.1347 - 2.3427		0.9615		276,317
								$	415,130
Deemed Dividends on Series B Warrants (see Note 8)
May 5, 2025	May 2025 Down Round Trigger		6,777,101	$	1.9445	$	0.8294	$	2,426,968
	Deemed Dividends on Series B Warrants							$	2,426,968
	Warrant Modification (i)							$	108,468
	Total Deemed Dividends							$	7,573,706

Deemed Dividends on Series F Preferred Stock
Date of Trigger Event	Description of Trigger Event	Series F Outstanding		Conversion Prices Prior to Trigger		Conversion Price After Trigger		Incremental Value Deemed Dividend
March 6, 2024	March 2024 Down Round Trigger		3,945	$	60.29 -124.50		30.00	$	5,102,674
August 27, 2024	August 2024 Down Round Trigger		3,755	$	23.15 - 37.00		20.19	$	1,233,685
October 1, 2024	October 2024 Offering		5,200	$	12.00 - 20.19		4.00	$	6,459,543
October 22, 2024	Share Combination Event		5,200	$	4.00		1.10	$	4,159,552
	Deemed Dividends on Series F							$	16,955,454

Deemed Dividends on Series F Warrants
Date of Trigger Event	Description of Trigger Event	Series F Warrants Outstanding		Conversion Prices Prior to Trigger		Conversion Price After Trigger		Incremental Value Deemed Dividend
March 6, 2024	March 2024 Down Round Trigger		54,695	$	60.29 - 124.50		30.00	$	147,030
August 27, 2024	August 2024 Down Round Trigger		137,331	$	23.15 - 37 .00		20.19		216,546
October 1, 2024	October 2024 Offering		162,096	$	20.19		4.00		365,665
October 22, 2024	Share Combination Event		162,096	$	4.00		1.10		64,007
	Deemed Dividends on Series F Warrants							$	793,248
	Warrant Modification (i)							$	7,752
	Total Deemed Dividends							$	17,756,454

Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

	Shares			Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2024		7,293		$	324.64
Granted		281,262			1.38
Canceled		(1,158	)		284.01
Vested and released		(235,357	)		2.75
Outstanding as of December 31, 2025		52,040		$	34.26
Vested as of December 31, 2025		1,243		$	1,363.11
Unvested as of December 31, 2025		50,797		$	1.75

	Shares			Weighted Average Grant Date Fair Value Per Share
Outstanding as of December 31, 2023		3,054		$	910.29
Granted		7,959			16.54
Canceled		(3,020	)		25.16
Vested and released		(700	)		782.79
Outstanding as of December 31, 2024		7,293		$	324.64
Vested as of December 31, 2024		3,443		$	661.60
Unvested as of December 31, 2024		3,850		$	16.74

Share-Based Payment Arrangement, Option, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding as of December 31, 2024		56		$	5,342	$	2,874		1.23	$	—
Granted		—			—		—		—		—
Exercised		—			—		—		—		—
Expired/forfeited		(56	)		2,874		160,941		—		—
Outstanding as of December 31, 2025		—		$	—	$	—		—	$	—
Exercisable as of December 31, 2025		—		$	—	$	—		—	$	—

	Shares			Weighted Average Exercise Price		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding as of December 31, 2023		2,505		$	2,000	$	1,080		1.49	$	2,294
Granted		—			—		—		—		—
Exercised		—			—		—		—		—
Expired/forfeited		(2,449	)		1,953		1,060		—		—
Outstanding as of December 31, 2024		56		$	5,342	$	2,874		1.23	$	—
Exercisable as of December 31, 2024		56		$	5,342	$	2,874		1.23	$	—

Equity-Linked Instruments [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	December 31, 2025			December 31, 2024
Expected term (years)		0.25 - 3.0			1 - 3
Volatility		131.32 - 162.77	%		84.88 - 152.24	%
Risk-free rate		3.50 - 4.41	%		3.52 - 4.55	%
Dividend yield		—	%		—	%