Note 10 - Stock-based Compensation (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
Nov. 30, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jan. 31, 2015 | Nov. 30, 2014 | Dec. 31, 2013 | Jul. 31, 2013 | [1] | Jun. 30, 2013 | [2] | Dec. 31, 2012 | [3] | Jul. 31, 2012 | [4] | Sep. 30, 2011 | [5] | Nov. 30, 2010 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011 |
Restricted Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 298,998 | | | 298,998 | | | | | |
The 2010 Plan [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | | | | | | | | | | | | | | | 1,000,000 | | | 1,000,000 | | | | | |
Allocated Share-based Compensation Expense | | | | | | | | | | | | | | | $ 580,379 | $ 331,306 | | $ 998,117 | $ 959,650 | | | | |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | | | | | | | | | | | | | | | $ 4,241,890 | | | $ 4,241,890 | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | 5,000 | 37,500 | 250,000 | 100,000 | 50,000 | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | | | | | | | | | | | | | | | | | | | | | 50,000 | 25,000 | 15,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | | | | | | | | | | | | | | | | | 190,000 | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | | | | | | | | | | | | | | | | | | 219 days | | | | | |
The 2010 Plan [Member] | Directors and Officers [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | | | | | | | | | | | | | 175,000 | 75,000 | 40,000 |
The 2010 Plan [Member] | Former Technical Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | | | | | | | | | | | | | 75,000 | 25,000 | 10,000 |
The 2010 Plan [Member] | Executives [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | | | | | | | | | 52,500 | | | | 37,500 | | |
The 2010 Plan [Member] | Employee of Avalon [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | | | | | | | | | | | | | | | | | | | | | 5,000 | | |
The 2010 Plan [Member] | Current Executives, Directors, and Consultants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cashless Exercises in Period | | | | | | | | | | | | | | | 190,000 | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | | | | | | | | | | | | | | 93,026 | | | | | | | | |
Proceeds from Stock Options Exercised | | | | | | | | | | | | | | | $ 0 | | | | | | | | |
The 2010 Plan [Member] | Current and Former Executives, Directors, and Consultants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Cashless Exercises in Period | | | | | | | | | | | | | | | | | | | | 140,000 | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | | | | | | | | | | | | | | | | | | | | 71,454 | | | |
Proceeds from Stock Options Exercised | | | | | | | | | | | | | | | | | | | | $ 0 | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 75,000 | | | 75,000 | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | November 2014 Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 9,000 | | | 9,000 | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | September 2015 Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 13,332 | | | 13,332 | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | August 2016 Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 46,666 | | | 46,666 | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Directors and Officers [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | | | | | | | | | | | | 70,429 | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Former Technical Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | | | | 10,000 | | | | | | | | 23,477 | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Directors, Executives, and a Former Technical Consultant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | | | | | | 95,000 | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | | | | | 2 years | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Directors, Executives, and a Former Technical Consultant [Member] | Vesting on the Date of Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | | | | | | | | 33.30% | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | 100,000 | | 85,000 | | 27,000 | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | 2 years | | 2 years | | 2 years | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives [Member] | Vesting on the Date of Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | | | 33.30% | | 33.30% | | 33.30% | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives [Member] | Share-based Compensation Award, Tranche Three [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | | | | | | | 33.30% | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives [Member] | Share-based Compensation Award, Tranche Two [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | | | | | | | 33.30% | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Two Non-executive Directors [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | | | 40,000 | | 30,000 | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | | | | 2 years | | 2 years | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | | | | | | 10,000 | | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Two Non-executive Directors [Member] | Vesting on the Date of Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | | | | 33.30% | | 33.30% | | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Two Non-executive Directors [Member] | Share-based Compensation Award, Tranche Two [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | | | | | | 66.60% | | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Non-Executive Directors [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | | 75,000 | | | | | | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Non-Executive Directors [Member] | November 2016 Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 75,000 | | | 75,000 | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 155,000 | | | | | | | | | | | | | | | | | | | | | | |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] | November 2017 Grant [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | | | | | | | | | | | | | | | 155,000 | | | 155,000 | | | | | |
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[1] | The Company granted 5,000 stock options to an employee of Avalon for services performed during fiscal year 2013. |
[2] | The Company granted 37,500 stock options to its executives for services performed during fiscal year 2013. |
[3] | The Company granted 175,000 stock options to its directors and executives and an additional 75,000 stock options to a former technical consultant for services performed during fiscal year 2013. Of the total options granted as a part of this grant, 50,000 were later forfeited. |
[4] | The Company granted 75,000 stock options to its directors and executives and an additional 25,000 stock options to a former technical consultant for services performed during fiscal year 2012. Of the total options granted as a part of this grant, 25,000 were later forfeited. |
[5] | The Company granted 40,000 stock options to its directors and executives and an additional 10,000 stock options to a former technical consultant, for services performed during fiscal year 2011. Of the total options granted 15,000 were later forfeited. |