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Note 10 - Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Mar. 31, 2022
Jul. 31, 2015
Share Repurchase Program Authorized in July 2015 [Member]          
Stock Repurchase Program, Authorized Amount         $ 25
Treasury Stock, Shares, Acquired (in shares)   0 0    
Share Repurchase Program Authorized in March 2022 [Member]          
Stock Repurchase Program, Authorized Amount       $ 3  
Treasury Stock, Shares, Acquired (in shares) 25,096        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) $ 4.09