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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ / shares in Thousands
Dec. 31, 2021
Dec. 31, 2020
Allowance for doubtful accounts $ 100,000 $ 100,000
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 10,000,000 10,000,000
Common stock, shares issued (in shares) 6,049,000 5,791,000
Common stock, shares outstanding (in shares) 6,049,000 5,791,000