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Note 14 - Employee Benefit Plans - Net Periodic Benefit Cost Recognized in Consolidated Statements of Operations (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Selling, general and administrative expenses $ 4,000 $ 5,000
Other expense, net 614,000 728,000
Total 618,000 733,000
Selling, General and Administrative Expenses [Member]    
Selling, general and administrative expenses $ 4,000 $ 5,000