Note 9 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	1 Months Ended	4 Months Ended	6 Months Ended
	Jul. 31, 2021	Oct. 31, 2021	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Gain (Loss) on Disposition of Property Plant Equipment, Total				$ 94	$ (0)
Forecast [Member]
Employee Tax Retention Credit			$ 5,000
Paycheck Protection Program CARES Act [Member] | Forecast [Member]
Long-term Debt, Applied for Forgiveness		$ 6,100
Consolidation of our Production Facilities and Closure of our Merrifield, Minnesota Facility [Member] | Subsequent Event [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ 100