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Note 8 - Stock-based Compensation Expense (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Allocated Share-based Compensation Expense $ 183,000 $ 176,000 $ 346,000 $ 371,000