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Note Q - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 28, 2020
Common Stock, Shares Authorized (in shares)   45,000,000 45,000,000    
Preferred Stock, Shares Authorized (in shares)   5,000,000 5,000,000    
Proceeds from Issuance of Common Stock   $ 15,397 $ 39,203 $ 0  
Initial ATM Offering [Member] | Raymond James & Associates, Inc. [Member]          
Common Stock, Maximum Amount to be Sold         $ 55,000
Stock Issued During Period, Shares, New Issues (in shares) 5,900,000        
Shares Issued, Price Per Share (in dollars per share) $ 9.12        
Proceeds from Issuance of Common Stock $ 53,900        
Second ATM Offering [Member] | Raymond James & Associates, Inc. [Member]          
Common Stock, Maximum Amount to be Sold   $ 35,000      
Stock Issued During Period, Shares, New Issues (in shares)   100,000      
Shares Issued, Price Per Share (in dollars per share)   $ 9.08      
Proceeds from Issuance of Common Stock   $ 1,000