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Note 9 - Term Loan and Line of Credit Agreements (Details Textual) - USD ($)
3 Months Ended
Dec. 20, 2016
Mar. 31, 2018
Mar. 31, 2017
Apr. 20, 2018
Dec. 31, 2017
Apr. 25, 2017
Apr. 24, 2017
Long-term Debt, Gross   $ 11,325,000          
Restricted Cash and Cash Equivalents, Noncurrent, Total   $ 1,326,000     $ 2,826,000    
Long-term Debt, Weighted Average Interest Rate, over Time   5.35% 5.35%        
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   4.75%          
Home Savings Bank [Member] | Subsequent Event [Member]              
Line of Credit Facility, Interest Rate at Period End       5.00%      
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   $ 11,325,000     11,464,000    
Debt Issuance Costs, Net, Total   167,000     172,000    
Term Loan Agreement [Member] | Laurel Capital Corporation [Member]              
Long-term Debt, Gross 12,000,000            
Restricted Cash and Cash Equivalents, Noncurrent, Total $ 2,900,000 $ 1,300,000     $ 2,800,000    
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, Total $ 191,000