Note 13 - Capital Stock - Outstanding Warrants (Details) - $ / shares		Jun. 30, 2024	Dec. 31, 2023
Number of shares issuable (in shares)		5,271,604	5,271,604
Common Stock Warrant Exercisable on December 2020, One [Member]
Exercise price (in dollars per share)	[1]	$ 230
Number of shares issuable (in shares)	[1]	120,375	120,375
Common Stock Warrant Exercisable on December 2020, Two [Member]
Exercise price (in dollars per share)	[2]	$ 230
Number of shares issuable (in shares)	[2]	1,229	1,229
Common Stock Warrant Exercisable on June 2023, One [Member]
Exercise price (in dollars per share)	[3]	$ 16
Number of shares issuable (in shares)	[3]	150,000	150,000
Common Stock Warrant Exercisable on June 2023, Two [Member]
Exercise price (in dollars per share)	[4]	$ 22
Number of shares issuable (in shares)	[4]	2,500,000	2,500,000
Common Stock Warrant Exercisable on June 2023, Three [Member]
Exercise price (in dollars per share)	[5]	$ 30
Number of shares issuable (in shares)	[5]	2,500,000	2,500,000

[1] Represents 120,375 shares of Common Stock underlying warrants to purchase one-fortieth (1/40) of one share of Common Stock, issued during Tottenham’s initial public offering. We may redeem the outstanding warrants at $0.01 per warrant if the last sales price of our Common Stock equals or exceeds $330.00 per share for any 20 trading days within a 30-trading day period. As of June 30, 2024 and December 31, 2023, no warrants had been exercised.

[2] Represents 1,229 shares of Common Stock underlying warrants to purchase one-fortieth (1/40) of one share of Common Stock, issued to the financial advisor and lead underwriter of Tottenham’s initial public offering upon their exercise of a unit purchase option in July 2021. As of June 30, 2024 and December 31, 2023, no warrants had been exercised.

[3] Represents 150,000 shares of Common Stock underlying the New Avenue Warrant, issued pursuant to the Second Amendment (see Note 8). As of June 30, 2024 and December 31, 2023, the warrant had not been exercised.

[4] Represents 2,500,000 shares of Common Stock underlying the Tranche A Warrants to purchase one share of Common Stock, issued in our June 2023 public equity offering. As of June 30, 2024 and December 31, 2023, no warrants had been exercised.

[5] Represents 2,500,000 shares of Common Stock underlying the Tranche B Warrants to purchase one share of Common Stock, issued in our June 2023 public equity offering. As of June 30, 2024 and December 31, 2023, no warrants had been exercised.