Note 4 - Other Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Other Liabilities [Table Text Block]

	December 31,
	2022		2021
Equipment maintenance and upgrades, non-related party	$	—	$	367,000
Insurance		591,000		340,000
Professional services		92,000		90,000
Operating costs		539,000		397,000
Other		322,000		311,000
Total other accrued liabilities	$	1,544,000	$	1,505,000