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Note 3 - Debt (Details Textual)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 11, 2019
USD ($)
shares
Oct. 08, 2018
USD ($)
Jun. 08, 2018
Dec. 14, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Interest Expense, Total         $ 516,161 $ 550,780 $ 1,063,067 $ 1,114,840      
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%              
Promissory Note [Member] | John H Schwan [Member]                      
Due to Related Parties, Total                     $ 1,099,000
Interest Payable                     400,000
Debt Conversion, Original Debt, Amount $ 600,000                    
Debt Conversion, Converted Instrument, Shares Issued | shares 180,723                    
Repayments of Related Party Debt         0   0     $ 0  
Interest Expense, Total         15,000   30,000        
PNC [Member] | PNC Agreements [Member]                      
Debt Instrument, Temporary Over-Advance         1,200,000   1,200,000        
Debt Instrument, Temporary Over-Advance, End Balance         $ 0   $ 0        
Debt Instrument, Temporary Over-Advance, Term             42 days        
Debt instrument, Amendment Fee             $ 250,000        
Debt Instrument, Interest Rate, Increase (Decrease)     2.00%                
PNC [Member] | PNC Agreements [Member] | Maximum [Member]                      
Fixed Charge Coverage Ratio     1.1                
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, Total                     $ 6,000,000
PNC [Member] | PNC Agreements, Amendment Two [Member]                      
Debt Instrument, Funding Proceeds Used to Repay Term Loan   $ 2,000,000             $ 5,000,000    
Debt Instrument, Covenant, Required Proceeds from Equity Issuance   7,500,000                  
Proceeds from Issuance or Sale of Equity, Total   $ 0