Note 12 - Stockholders' Equity - Unvested Units Expected to Vest (Details)	Dec. 31, 2021 shares
Unvested units expected to vest (in shares)	2,022,352
Share-based Payment Arrangement, Tranche One [Member]
Unvested units expected to vest (in shares)	1,295,620
Share-based Payment Arrangement, Tranche Two [Member]
Unvested units expected to vest (in shares)	567,257
Share-based Payment Arrangement, Tranche Three [Member]
Unvested units expected to vest (in shares)	159,475