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Note 2 - Notes Payable and Long-term Debt (Details Textual)
1 Months Ended 3 Months Ended
Sep. 18, 2015
USD ($)
shares
Apr. 30, 2008
Jul. 31, 2007
USD ($)
a
ft²
Sep. 30, 2015
USD ($)
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
Jun. 23, 2014
USD ($)
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]                  
Line of Credit Facility, Maximum Borrowing Capacity $ 6,000,000                
Debt Instrument, Term 2 years                
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         $ 2,900,000        
Treasury Stock, Shares, Acquired | shares         404,000        
Line of Credit Facility, Remaining Borrowing Capacity         $ 3,400,000        
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         2.278%   2.263%    
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         $ 2,870,000