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Note 2 - Notes Payable and Long-term Debt (Details Textual)
1 Months Ended 9 Months Ended
Sep. 18, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Apr. 30, 2008
Jul. 31, 2007
USD ($)
a
ft²
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Jun. 23, 2014
USD ($)
Jul. 12, 2012
USD ($)
Promissory Note and Business Loan Agreement with BOKF [Member] | Maximum [Member]                
Debt Instrument, Covenants, Debt to EBITDA Ratio 1.5              
Promissory Note and Business Loan Agreement with BOKF [Member] | Minimum [Member]                
Debt Instrument, Covenants, Fixed Charge Coverage Ratio 1.2              
Promissory Note and Business Loan Agreement with BOKF [Member]                
Debt Instrument, Term 2 years              
Line of Credit Facility, Maximum Borrowing Capacity $ 6,000,000              
Promissory Note with BOKF [Member]                
Line of Credit Facility, Maximum Borrowing Capacity $ 10,000,000              
Line of Credit Facility, Maximum Shares to Be Purchased by Borrowing | shares 1,200,000              
Line of Credit Facility, Term of the Term Note into which the Principal Balance Will Be Rolled 4 years              
Proceeds from Issuance of Long-term Debt   $ 3,700,000            
Treasury Stock, Shares, Acquired | shares   529,000            
Two Promissory Notes with BOKF [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.85%            
Two Promissory Notes with BOKF [Member]                
Debt Instrument, Interest Rate, Effective Percentage   2.04%     2.04%      
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Building [Member]                
Area of Real Estate Property | ft²       191,000        
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Land [Member]                
Area of Real Estate Property | a       30        
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Term Note [Member] | Interest Expense [Member]                
Debt Instrument, Prepayment Penalty   $ 200,000            
Credit Agreement with JPMorgan Chase Bank, N.A. [Member] | Term Note [Member]                
Debt Instrument, Term     10 years          
Debt Instrument, Interest Rate, Stated Percentage     7.10%          
Credit Agreement with JPMorgan Chase Bank, N.A. [Member]                
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,500,000        
Proceeds from Bank Debt       $ 4,050,000        
Line of Credit Note with JPMorgan Chase Bank, N.A.[Member]                
Line of Credit Facility, Maximum Borrowing Capacity             $ 6,000,000 $ 4,000,000
Proceeds from Issuance of Long-term Debt         $ 3,711,224