Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended
Note 5 - Income Taxes (Details Textual) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Deferred Tax Assets, Operating Loss Carryforwards, Total	$ 65,627	$ 63,080
Operating Loss Carryforwards, Total	$ 312,511
Deferred Tax Assets Valuation Allowance Percentage	100.00%
Expires in the Years 2024 to 2037 [Member]
Operating Loss Carryforwards, Total	$ 238,932
Expires in 2024 [Member]
Operating Loss Carryforwards, Total	7,297
Expires in 2025 [Member]
Operating Loss Carryforwards, Total	12,450
Expires in 2026 [Member]
Operating Loss Carryforwards, Total	9,621
Expires in 2027 [Member]
Operating Loss Carryforwards, Total	20,306
Expires in 2028 [Member]
Operating Loss Carryforwards, Total	16,739
Expires in 2029 [Member]
Operating Loss Carryforwards, Total	15,325
Expires in 2030 [Member]
Operating Loss Carryforwards, Total	16,318
Expires in 2031 [Member]
Operating Loss Carryforwards, Total	18,203
Expires in 2032 [Member]
Operating Loss Carryforwards, Total	19,160
Expires in 2033 [Member]
Operating Loss Carryforwards, Total	20,410
Expires in 2034 [Member]
Operating Loss Carryforwards, Total	20,535
Expires In 2035 [Member]
Operating Loss Carryforwards, Total	19,605
Expires in 2036 [Member]
Operating Loss Carryforwards, Total	23,278
Expires in 2037 [Member]
Operating Loss Carryforwards, Total	19,685
No Expiration [Member]
Operating Loss Carryforwards, Total	$ 73,579

MADISON AVE HOLDINGS INC 10-Q