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Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares
Oct. 04, 2020
Dec. 31, 2019
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 975,150 975,150
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 21,321,790 21,324,618
Common stock, shares outstanding (in shares) 21,316,752 21,298,426
Treasury stock (in shares) 5,038 26,192
Series A Preferred Stock [Member]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 24,850 24,850
Preferred stock, shares issued (in shares) 0 0
Nonvoting Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 0 0