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Note 6 - Stockholders' Equity (Details Textual) - USD ($)												3 Months Ended		6 Months Ended
	Mar. 05, 2025	Sep. 30, 2024	Jan. 15, 2024	Dec. 19, 2023	Apr. 15, 2023	Mar. 12, 2023	Dec. 16, 2022	Dec. 15, 2022	Mar. 25, 2022	Dec. 17, 2021	May 14, 2021	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Payments of Ordinary Dividends, Common Stock														$ 185,579	$ 46,437
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				19,500			16,500			15,000	70,000			0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value											$ 128,726
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total												$ 115,298	$ 294,000	$ 115,298	$ 294,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value				$ 38,331			$ 37,969			$ 22,919
Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)											20,000
Robert Siqveland [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)								20,000			20,000
Severance Costs			$ 33,500		$ 100,500
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)											30,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense												0	5,746	$ 0	5,746
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)														2 years
Share-Based Payment Arrangement, Option [Member] \| Vesting Immediately [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage											25.00%
Share-Based Payment Arrangement, Option [Member] \| Vesting Each Subsequent Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage											25.00%
Share-Based Payment Arrangement, Option [Member] \| Robert Siqveland [Member]
Share-Based Payment Arrangement, Expense								$ 37,000
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		703				10,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						3 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 2,700				$ 50,500
Share-Based Payment Arrangement, Expense												$ 19,477	$ 38,954	$ 19,477	$ 38,954
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)												39,500	60,500	39,500	60,500
Restricted Stock [Member] \| Robert Siqveland [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								12,500	12,500
Share-Based Payment Arrangement, Expense								$ 39,000
Restricted Stock [Member] \| Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									87,500
Restricted Stock [Member] \| Chief Financial Officer and Corporate Secretary [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)									5 years
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total									$ 349,000
Restricted Stock [Member] \| Chief Financial Officer and Corporate Secretary [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)									20,000
The 2021 Stock Incentive Plan [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)											10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)											500,000
Executive Bonus Plan 2024 [Member]
Shares Issuable, Maximum, Percentage of Declared Bonus	25.00%
Shares Issuable Valued, Percentage of Weighted Average Trade Value	90.00%
Executive Bonus Plan 2024 [Member] \| Chief Executive Officer [Member]
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares)	2,100
Executive Bonus Plan 2024 [Member] \| Chief Financial Officer [Member]
Stock Issued During Period, Shares, Treasury Stock Reissued (in shares)	1,855