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Note 8 - Notes Payable and Capital Leases (Details Textual)
12 Months Ended
Dec. 14, 2017
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Potential Percent Increase in Interest Rates Contingent on Covenant Compliance   2.00%    
PNC [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]        
Derivative Liability, Notional Amount $ 3,000,000      
Derivative, Term of Contract 3 years      
Derivative, Fixed Interest Rate 2.25%      
Maximum [Member]        
Fixed Charge Coverage Ratio   1.1    
BMO [Member]        
Long-term Debt     $ 17,000,000  
PNC [Member] | Term Loan [Member]        
Long-term Debt   $ 6,000,000  
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity   18,000,000    
PNC [Member] | PNC Agreements [Member] | Term Loan [Member]        
Long-term Debt   $ 6,000,000