Note 2 - Summary of Significant Accounting Policies - Share-based Compensation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Outstanding awards (in shares)	198,277
Award expense	$ 81,746	$ 0
Restricted Stock Units (RSUs) [Member] | Vesting in Four Tranches [Member]
Outstanding awards (in shares)	99,766
Award expense	$ 7,233
Restricted Stock Units (RSUs) [Member] | Vesting Immediately [member]
Outstanding awards (in shares)	15,750
Award expense	$ 68,513
Restricted Stock [Member] | Vesting in Four Tranches [Member]
Outstanding awards (in shares)	82,761
Award expense	$ 6,000