Note 4 - Other Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Other Liabilities [Table Text Block]

	March 31,		December 31,
	2022		2021
Equipment maintenance and upgrades	$	502,000	$	1,281,000
Insurance		227,000		340,000
Professional services		188,000		90,000
Operating costs		384,000		397,000
Other		334,000		311,000
Total other accrued liabilities	$	1,635,000	$	2,419,000