Note 1 - Background and Significant Accounting Policies - Computation of Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Net income from continuing operations available to common stockholders	$ (448,772)	$ 4,518,303	$ (1,259,918)	$ 3,461,855	$ 3,461,855	$ 4,518,303
Interest expense on convertible notes payable					114,839	159,442
Effect of assumed conversions					(114,839)	(159,442)
Continuing operations, diluted	(448,772)	4,358,861	(1,259,918)	3,347,016	3,347,016	4,358,861
Discontinued operations, diluted	0	(192,766)	0	(324,590)	(324,590)	(192,766)
Net income (loss) available to common stockholders, diluted	$ (448,772)	$ 4,166,095	$ (1,259,918)	$ 3,022,426	$ 3,022,426	$ 4,166,095
Weighted-average common shares outstanding (in shares)	378,912,416	317,435,744	350,397,710	316,853,591	316,853,591	317,435,744
Warrants (in shares)						6,174,746
Convertible notes payable (in shares)					18,710,000	18,710,000
Dilutive potential common shares (in shares)					26,611,322	24,884,746
Adjusted weighted-average shares (in shares)	378,912,416	342,320,490	350,397,710	343,464,913	343,464,913	342,320,490
Continuing operations, per diluted share (in dollars per share)	$ (0.00)	$ 0.01	$ (0.00)	$ 0.01	$ 0.01	$ 0.01
Discontinued operations, per diluted share (in dollars per share)	0	(0.00)	0	(0.00)	(0.00)	(0.00)
Net income (loss) available to common stockholders, per diluted share (in dollars per share)	$ (0.00)	$ 0.01	$ (0.00)	$ 0.01	$ 0.01	$ 0.01
Warrant [Member]
Warrants (in shares)					7,695,439
Share-Based Payment Arrangement, Option [Member]
Warrants (in shares)					205,882