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Note 7 - Capital Stock, Treasury Stock, Contributed Capital and Stock Options (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Feb. 27, 2013
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          
Common Class A [Member] | Directors Plans [Member] | Minimum [Member]            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit $ 2.925          
Common Class A [Member] | Directors Plans [Member] | Maximum [Member]            
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit $ 11          
Common Class A [Member] | Directors Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 5,000 20,000 5,000 20,000 6,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 1,000 2,000        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 2.925 $ 6.45        
Common Class A [Member]            
Common Stock, Capital Shares Reserved for Future Issuance 832,233   832,233      
Directors Plans [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years          
Allocated Share-based Compensation Expense $ 0 $ 0 $ 0 $ 543    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 5.00% 5.00% 5.00% 5.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 10 years 10 years 10 years 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 0.00% 0.00% 0.00% 0.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 0.87% 0.87% 0.87% 0.87%