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Note 15 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allocated Share-based Compensation Expense | $ 1,443,346 | $ 1,187,036 | $ 947,174
Employee Stock Option |  |  |
Allocated Share-based Compensation Expense | 471,849 | 554,435 | 424,904
Restricted Stock |  |  |
Allocated Share-based Compensation Expense | 856,731 | 552,907 | 460,853
Employee Stock Purchase Plan |  |  |
Allocated Share-based Compensation Expense | $ 114,766 | $ 79,694 | $ 61,417

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