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Note 3 - Term Loan and Line of Credit Agreements (Details Textual) - USD ($)
12 Months Ended
Dec. 20, 2016
Dec. 31, 2017
Dec. 31, 2016
Apr. 25, 2017
Apr. 24, 2017
Long-term Debt, Gross   $ 11,464,000      
Repayments of Lines of Credit   $ 9,000,000    
Restricted Cash and Cash Equivalents, Noncurrent   $ 2,826,000 $ 2,905,000    
Long-term Debt, Weighted Average Interest Rate, over Time   5.35% 3.80%    
Home Savings Bank [Member]          
Repayments of Lines of Credit $ 9,100,000        
Line of Credit Facility, Maximum Borrowing Capacity 4,000,000     $ 5,000,000 $ 4,000,000
Line of Credit Facility, Amounts in Excess of, Subject to Borrowing Base   $ 1,000,000      
Line of Credit, Current   $ 0 $ 0    
Line of Credit Facility, Interest Rate at Period End   4.50%      
Home Savings Bank [Member] | Line of Credit [Member] | Prime Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate   0.25%      
Term Loan Agreement [Member]          
Long-term Debt, Gross   $ 11,464,000 12,000,000    
Debt Issuance Costs, Net   172,000 189,000    
Term Loan Agreement [Member] | Laurel Capital Corporation [Member]          
Long-term Debt, Gross 12,000,000        
Restricted Cash and Cash Equivalents, Noncurrent $ 2,900,000 $ 2,800,000 $ 2,900,000    
Debt Instrument, Periodic Payment, Number of Payments 119        
Debt Instrument, Maturity Schedule 15 years        
Debt Instrument, Interest Rate, Stated Percentage, First Five Years 5.35%        
Debt Instrument, Interest Rate, Stated Percentage, After Year Five, if Greater Than Sum of Index Rate and 3.95% 5.35%        
Debt Instrument, Interest Rate, Stated Percentage, After Year Five, Plus Index Rate, if Greater Than 5.35% 3.95%        
Debt Instrument, Maximum Interest Rate, Years Six Through Ten 7.50%        
Debt Instrument, Prepayment Penalty, Percentage, First Five Years 5.00%        
Debt Instrument, Prepayment Penalty, Percentage, Years Six and Seven 4.00%        
Debt Instrument, Prepayment Penalty, Percentage, Years Eight and Nine 3.00%        
Debt Instrument, Prepayment Penalty, Percentage, Year Ten 2.00%        
Debt Issuance Costs, Net $ 191,000