Note 9 - Stock Based Compensation - Summary of Stock Options (Details) - USD ($)		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Outstanding (in shares)		100,000
Outstanding (in shares)		100,000	100,000
The 2010 Plan [Member]
Outstanding (in shares)		100,000
Outstanding, weighted average exercise price (in dollars per share)		$ 14.50
Granted (in shares)			100,000
Granted, weighted average exercise price (in dollars per share)			$ 14.50
Exercised (in shares)
Exercised, weighted average exercise price (in dollars per share)
Forfeited (in shares)
Forfeited, weighted average exercise price (in dollars per share)
Outstanding (in shares)		100,000	100,000
Outstanding, weighted average exercise price (in dollars per share)		$ 14.50	$ 14.50
Aggregate intrinsic value, outstanding		$ 595,468
Exercisable, end of year (in shares)		50,000
Exercisable, end of year, weighted average exercise price (in dollars per share)
Aggregate intrinsic value, exercisable		$ 297,734
Available for grant, end of year (in shares)		260,927	466,760
Weighted average fair value of options granted during the year (in dollars per share)	[1]		$ 7.42

[1] The fair value of each option is estimated as of the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used for grant during the year ended June 30, 2020 respectively: (i) risk-free interest rate of 1.56 percent (ii) expected life of 3.3 (iii) expected volatility of 74.0 percent and (iv) expected dividend yield of zero percent. There were no options granted during the fiscal year ended June 30, 2021.