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Note 10 - Debts and Commitments (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2015
USD ($)
ft²
a
Sep. 30, 2014
USD ($)
ft²
Sep. 30, 2013
USD ($)
Sep. 30, 2017
ft²
Payments to Acquire Property, Plant, and Equipment, Total $ 41,000 $ 7,000 $ 75,000 $ 194,000        
Operating Leases, Rent Expense, Total     $ 487,000 $ 356,000        
San Francisco Office [Member]                
Area of Real Estate Property | ft²           6,200    
Lessee, Operating Lease, Renewal Term           5 years    
Operating Lease, Monthly Rent           $ 25,000    
Englewood, Colorado Office [member]                
Area of Real Estate Property | ft²               9,800
Utah [Member] | Building [Member]                
Area of Real Estate Property | ft²         30,700      
Utah [Member] | Land [Member]                
Area of Land | a         3.6      
Utah [Member] | Land and Building [Member]                
Payments to Acquire Property, Plant, and Equipment, Total         $ 1,240,000      
Margin Account [Member]                
Proceeds from Issuance of Debt             $ 29,500,000  
Margin Account [Member] | Fed Funds Rate [Member]                
Debt Instrument, Basis Spread on Variable Rate             0.50%  
Debt Instrument, Interest Rate, Effective Percentage 2.00%   2.00%          
Real Estate Bank Loan Secured by Logan Office [Member]                
Loans Payable to Bank, Total $ 2,010,000   $ 2,010,000   $ 2,260,000      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate         4.66%      
Debt Instrument, Periodic Payment, Total         $ 17,600