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Note 15 - Stock Repurchase Plan (Details Textual) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 02, 2019
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) 657,451     750,000
Stock Repurchased and Retired During Period, Shares (in shares) 0 43,458 49,091