Note 17 - Subsequent Event (Details Textual) $ / shares in Units, $ in Thousands, $ in Millions	Aug. 31, 2022 USD ($)	Aug. 31, 2022 CAD ($) $ / shares	Jun. 13, 2022
Subsequent Event [Member] | Common Stock Owned by Company Shareholders [Member]
Percentage of Common Shares Outstanding Owned			86.30%
Subsequent Event [Member] | Common Stock Owned by UEX Shareholders [Member]
Percentage of Common Shares Outstanding Owned			13.70%
UEX Corporation [Member] | Forecast [Member]
Percentage of Votes Required Upon Approval		66.67%
Termination Fees	$ 8,250
UEX Corporation [Member] | Private Placement [Member] | Forecast [Member] | UEX Shares [Member]
Payments to Acquire Investments, Total		$ 5
Share Purchased, Price Per Share (in CAD per share) | $ / shares		$ 0.43
UEX Corporation [Member] | Subsequent Event [Member]
Percentage of Each Share Received in Exchange for Other Shares			0.0831%