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Note 11 - Stock Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Directors Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years        
Allocated Share-based Compensation Expense $ 0 $ 0 $ 129,832 $ 0 $ 543
Common Class A [Member]          
Common Stock, Capital Shares Reserved for Future Issuance 832,233   832,233 832,233  
Common Class A [Member] | Omnibus 2013 Equity Plan [Member]          
Common Stock, Capital Shares Reserved for Future Issuance 150,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0   36,333    
Common Class A [Member] | Directors Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 5,000