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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 2,730 $ 2,194
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,500 1,500
Preferred stock, shares outstanding 0 0
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 44,000 44,000
Common stock, shares issued 20,352 19,354
Common stock, shares outstanding 19,968 18,970
Treasury stock, shares 384 384
Contingent purchase consideration $ 3,038 $ 0