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Note 9 - Stock-based Compensation Expense (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allocated Share-based Compensation Expense, Total $ 280,000 $ 242,000 $ 704,000 $ 678,000