Note 9 - Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Total long term debt, net	$ 2,252	$ 2,539
Total long term debt, net	2,252	2,539
Mortgage Agreement [Member]
Total long term debt, net	2,190	2,469
Total long term debt, net	2,190	2,469
Equipment Notes, May 2021 [Member] | Notes Payable, Other Payables [Member]
Total long term debt, net	31	33
Total long term debt, net	31	33
Equipment Notes, December 2019 [Member] | Notes Payable, Other Payables [Member]
Total long term debt, net	24	26
Total long term debt, net	24	26
Equipment Notes, November 2018 [Member] | Notes Payable, Other Payables [Member]
Total long term debt, net	7	11
Total long term debt, net	$ 7	$ 11