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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
shares in Thousands, $ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current Assets:    
Allowance for doubtful accounts $ 1,126 $ 1,129
Noncurrent Assets:    
Allowance for obsolescence 37 64
Accumulated depreciation, rental equipment 178,038 172,563
Accumulated depreciation, property and equipment 16,305 15,784
Accumulated amortization, operating lease right of use assets 602 555
Accumulated amortization, intangibles $ 2,165 $ 2,134
Stockholders’ Equity:    
Preferred stock, shares authorized (in shares) 5,000 5,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, shares authorized (in shares) 30,000 30,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares issued (in shares) 13,473 13,394
Treasury shares (in shares) 1,022 775