Note 13 - Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares		3 Months Ended
	Jan. 13, 2020	Jun. 30, 2021	Jun. 30, 2020
Outstanding, beginning of year (in shares)		300,000	300,000
Outstanding, beginning of year, weighted average exercise price (in dollars per share)		$ 0.20	$ 0.20
Issued (in shares)	300,000	0	0
Issued, weighted average exercise price (in dollars per share)	$ 0.20	$ 0	$ 0
Exercised (in shares)		0	0
Exercised, weighted average exercise price (in dollars per share)		$ 0	$ 0
Expired (in shares)		0	0
Expired, weighted average exercise price (in dollars per share)		$ 0	$ 0
Cancelled (in shares)		(300,000)
Cancelled, weighted average exercise price (in dollars per share)		$ 0.20
Outstanding, end of period (in shares)		0	300,000
Outstanding, beginning of year, weighted average exercise price (in dollars per share)		$ 0	$ 0.20
Exercisable, end of period (in shares)		0	0
Exercisable, end of period (in dollars per share)		$ 0	$ 0