Note 8 - Stockholders' Equity - Summary of Shares to be Issued (Details) - shares	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Shares-to-be-issued, outstanding (in shares)	2,066,343	2,428,329
Granted in current period (in shares)	108,148	33,238
Issued in current period (in shares)	(147,338)	(53,416)
Shares-to be issued outstanding (in shares)	2,027,153	2,408,151