Note 4 - Other Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Other Liabilities [Table Text Block]

	December 31,
	2021		2020
Equipment maintenance and upgrades	$	1,281,000	$	—
Insurance		340,000		471,000
Professional services		90,000		211,000
Operating costs		397,000		703,000
Other		311,000		660,000
Total other accrued liabilities	$	2,419,000	$	2,045,000