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Note 9 - Notes Payable and Capital Leases (Details Textual)
1 Months Ended 12 Months Ended
May 15, 2019
USD ($)
Dec. 14, 2017
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 15, 2018
USD ($)
Oct. 08, 2018
USD ($)
Oct. 07, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
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, Total                 $ 17,000,000
PNC [Member] | Term Loan [Member]                  
Long-term Debt, Total       $ 4,700,000       $ 6,000,000  
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member]                  
Line of Credit Facility, Maximum Borrowing Capacity               18,000,000  
Line of Credit Facility, Funding Proceeds That Must be Used to Repay Debt           $ 2,000,000 $ 5,000,000    
Line of Credit Facility, Covenant, Gross Proceeds to be Raised         $ 7,500,000        
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] | Scenario, Forecast [Member]                  
Line of Credit Facility, Temporary Over-advance $ 0                
PNC [Member] | PNC Agreements [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]                  
Line of Credit Facility, Temporary Over-advance     $ 1,200,000            
Line of Credit Facility, Temporary Over-advance, Fee     $ 250,000            
PNC [Member] | PNC Agreements [Member] | Term Loan [Member]                  
Long-term Debt, Total               $ 6,000,000