Note 13 - Capital Stock - Outstanding Warrants (Details) - $ / shares		Mar. 31, 2024	Dec. 31, 2023
Number of shares issuable (in shares)		105,432,083	105,432,083
Common Stock Warrant Exercisable on December 2020, One [Member]
Exercise price (in dollars per share)		$ 11.5
Number of shares issuable (in shares)	[1]	2,407,500	2,407,500
Common Stock Warrant Exercisable on December 2020, Two [Member]
Exercise price (in dollars per share)		$ 11.5
Number of shares issuable (in shares)	[2]	24,583	24,583
Common Stock Warrant Exercisable on June 2023, One [Member]
Exercise price (in dollars per share)		$ 0.8
Number of shares issuable (in shares)	[3]	3,000,000	3,000,000
Common Stock Warrant Exercisable on June 2023, Two [Member]
Exercise price (in dollars per share)		$ 1.1
Number of shares issuable (in shares)	[4]	50,000,000	50,000,000
Common Stock Warrant Exercisable on June 2023, Three [Member]
Exercise price (in dollars per share)		$ 1.5
Number of shares issuable (in shares)	[5]	50,000,000	50,000,000

[1] Represents 2,407,500 shares of Common Stock underlying warrants to purchase one-half (1/2) 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 $16.50 per share for any 20 trading days within a 30-trading day period. As of March 31, 2024 and December 31, 2023, no warrants had been exercised.

[2] Represents 24,583 shares of Common Stock underlying warrants to purchase one-half (1/2) 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 March 31, 2024 and December 31, 2023, no warrants had been exercised.

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

[4] Represents 50,000,000 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 March 31, 2024 and December 31, 2023, no warrants had been exercised.

[5] Represents 50,000,000 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 March 31, 2024 and December 31, 2023, no warrants had been exercised.