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Note 12 - Subsequent Events (Details Textual) - USD ($)
6 Months Ended 9 Months Ended
Nov. 06, 2018
Oct. 31, 2018
May 08, 2018
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Dividends, Common Stock, Total         $ 21,766,000 $ 16,612,000
Platanares Finance Agreement [Member] | OPIC [Member] | Scenario, Forecast [Member] | Maximum [Member]            
Proceeds from Issuance of Debt       $ 10,000,000    
Director [Member] | Stock Appreciation Rights (SARs) [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     295,671      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 14.56      
Director [Member] | Restricted Stock Units (RSUs) [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     40,489      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 54.92      
Subsequent Event [Member]            
Dividends, Common Stock, Total $ 5,100,000          
Common Stock, Dividends, Per Share, Declared $ 0.10          
Dividends Payable, Date Declared Nov. 06, 2018          
Dividends Payable, Date of Record Nov. 20, 2018          
Dividends Payable, Date to be Paid Dec. 04, 2018          
Subsequent Event [Member] | Platanares Finance Agreement [Member] | OPIC [Member]            
Debt Agreement, Maximum Borrowing Capacity   $ 124,700,000        
Proceeds from Issuance of Debt   $ 114,700,000        
Debt Instrument, Interest Rate, Stated Percentage   7.02%        
Debt Instrument, Term   14 years        
Subsequent Event [Member] | Stock Appreciation Rights (SARs) [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 6 years          
Subsequent Event [Member] | Restricted Stock Units (RSUs) [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 6 years          
Subsequent Event [Member] | Director [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Value for Each Individual $ 120,000          
Subsequent Event [Member] | Director [Member] | Stock Appreciation Rights (SARs) [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 15,395          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 14.80          
Subsequent Event [Member] | Director [Member] | Restricted Stock Units (RSUs) [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 17,338          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 52.60          
Subsequent Event [Member] | Board of Directors Chairman [Member] | The 2018 Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Value for Each Individual $ 180,000