Note 6 - Stockholders' Equity - Schedule of Warrants and Options Outstanding (Details) - $ / shares	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Exercise Price (in dollars per share)	$ 0.2	$ 0.23	$ 0.3
Number of Shares (in shares)	32,900,882	34,091,250	26,391,250
Warrants and Options [Member]
Exercise Price (in dollars per share)	$ 0.24
Number of Shares (in shares)	62,204,034
Warrants Expiring March 31, 2025 [Member]
Exercise Price (in dollars per share)	$ 0.05
Number of Shares (in shares)	23,428,348
Warrants Expiring March 31, 2025 2 [Member]
Exercise Price (in dollars per share)	$ 0.05
Number of Shares (in shares)	4,376,000
Warrants Expiring January 31, 2026 [Member]
Exercise Price (in dollars per share)	$ 2
Number of Shares (in shares)	1,498,804
Share-Based Payment Arrangement, Employee [Member] | Expiring September 23, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	795,000
Share-Based Payment Arrangement, Employee [Member] | Expiring October 1, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	30,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2033 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 1, 2028 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	55,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 1, 2033 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	10,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 22, 2033 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	895,000
Share-Based Payment Arrangement, Employee [Member] | Expiring November 18, 2029 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	70,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2034 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring August 12, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	55,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 1, 2034 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	10,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2033 2 [Member]
Exercise Price (in dollars per share)	$ 0.06
Number of Shares (in shares)	50,000
Share-Based Payment Arrangement, Employee [Member] | Expiring April 15, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	960,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 22, 2033 2 [Member]
Exercise Price (in dollars per share)	$ 0.07
Number of Shares (in shares)	6,525,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2034 2 [Member]
Exercise Price (in dollars per share)	$ 0.07
Number of Shares (in shares)	125,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 1, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	107,500
Share-Based Payment Arrangement, Employee [Member] | Expiring January 17, 2032 2 [Member]
Exercise Price (in dollars per share)	$ 0.14
Number of Shares (in shares)	210,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	50,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.15
Number of Shares (in shares)	3,200,000
Share-Based Payment Arrangement, Employee [Member] | Expiring April 17, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	40,000
Share-Based Payment Arrangement, Employee [Member] | Expiring April 15, 2032 2 [Member]
Exercise Price (in dollars per share)	$ 0.15
Number of Shares (in shares)	6,304,325
Share-Based Payment Arrangement, Employee [Member] | Expiring May 21, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	200,000
Share-Based Payment Arrangement, Employee [Member] | Expiring December 10, 2025 [Member]
Exercise Price (in dollars per share)	$ 0.16
Number of Shares (in shares)	340,000
Share-Based Payment Arrangement, Employee [Member] | Expiring December 2, 2025 [Member]
Exercise Price (in dollars per share)	$ 0.18
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 23, 2032 2 [Member]
Exercise Price (in dollars per share)	$ 0.18
Number of Shares (in shares)	5,130,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2028 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring August 1, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.24
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring April 6, 2028 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	4,000
Share-Based Payment Arrangement, Employee [Member] | Expiring August 12, 2032 2 [Member]
Exercise Price (in dollars per share)	$ 0.24
Number of Shares (in shares)	118,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 6, 2029 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 1, 2031 2 [Member]
Exercise Price (in dollars per share)	$ 0.25
Number of Shares (in shares)	413,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 18, 2029 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	35,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 3, 2025 [Member]
Exercise Price (in dollars per share)	$ 0.28
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 3, 2029 [Member]
Exercise Price (in dollars per share)	$ 0.28
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 5, 2030 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	35,000
Share-Based Payment Arrangement, Employee [Member] | Expiring June 15, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.29
Number of Shares (in shares)	25,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2031 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	75,000
Share-Based Payment Arrangement, Employee [Member] | Expiring July 9, 2031 [Member]
Exercise Price (in dollars per share)	$ 0.39
Number of Shares (in shares)	1,435,000
Share-Based Payment Arrangement, Employee [Member] | Expiring May 21, 2031 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	200,000
Share-Based Payment Arrangement, Employee [Member] | Expiring May 21, 2027 2 [Member]
Exercise Price (in dollars per share)	$ 0.59
Number of Shares (in shares)	1,400,000
Share-Based Payment Arrangement, Employee [Member] | Expiring July 17, 2031 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	300,000
Share-Based Payment Arrangement, Employee [Member] | Expiring May 21, 2031 2 [Member]
Exercise Price (in dollars per share)	$ 0.59
Number of Shares (in shares)	1,600,000
Share-Based Payment Arrangement, Employee [Member] | Expiring September 1, 2031 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	10,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2027 2 [Member]
Exercise Price (in dollars per share)	$ 0.92
Number of Shares (in shares)	350,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 5, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	500,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 4, 2031 2 [Member]
Exercise Price (in dollars per share)	$ 0.92
Number of Shares (in shares)	550,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 17, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	55,000
Share-Based Payment Arrangement, Employee [Member] | Expiring January 2, 2025 [Member]
Exercise Price (in dollars per share)	$ 1.38
Number of Shares (in shares)	96,557
Share-Based Payment Arrangement, Employee [Member] | Expiring September 1, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	10,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring October 1, 2027 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	10,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring January 1, 2028 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	7,500
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring February 28, 2028 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	30,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring September 22, 2033 [Member]
Exercise Price (in dollars per share)	$ 0.07
Number of Shares (in shares)	55,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring November 18, 2029 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	80,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring August 12, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Shares (in shares)	20,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring April 15, 2032 [Member]
Exercise Price (in dollars per share)	$ 0.15
Number of Shares (in shares)	50,000
Share-Based Payment Arrangement, Nonemployee [Member] | Expiring December 10, 2029 [Member]
Exercise Price (in dollars per share)	$ 0.16
Number of Shares (in shares)	75,000