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Note 5 - Share Repurchase Program (Details Textual)
3 Months Ended 9 Months Ended
Aug. 13, 2020
Mar. 31, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
shares
Dec. 31, 2020
shares
Aug. 31, 2020
shares
Aug. 31, 2019
USD ($)
shares
Stock Repurchase Program, Authorized Amount | $           $ 34,000,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) | shares         2,700,000 1,800,000
Stock Repurchased and Retired During Period, Shares (in shares) | shares   53,064 0 0    
Stock Repurchased and Retired During Period, Value | $   $ 597,000        
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $     $ 33,400,000      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) | shares     2,600,000      
Stock Split To [Member]            
Stockholders' Equity Note, Stock Split, Conversion Ratio 3          
Stock Split from [Member]            
Stockholders' Equity Note, Stock Split, Conversion Ratio 2