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Note 9 - Basic and Diluted Earnings Per Common Share (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 5,300,000 $ 7,200,000 $ 13,900,000 $ 19,700,000
Stock Repurchase [Member]        
Stock Repurchased and Retired During Period, Shares 0 0 0 308,416
Employee Stock Option [Member]        
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ 345,200   $ 349,700  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 76,750   95,950