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Note 7 - Term Loan and Line of Credit Agreements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Dec. 20, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Apr. 25, 2017
Apr. 24, 2017
Dec. 31, 2016
Long-term Debt, Gross   $ 11,601,000   $ 11,601,000        
Restricted Cash and Cash Equivalents, Noncurrent   $ 2,826,000   $ 2,826,000       $ 2,905,000
Long-term Debt, Weighted Average Interest Rate, over Time   5.35% 3.75% 5.35% 3.75%      
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   $ 1,000,000        
Line of Credit, Current   $ 0   $ 0       0
Line of Credit Facility, Interest Rate at Period End   4.50%   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   $ 11,601,000   $ 11,601,000       12,000,000
Debt Issuance Costs, Net   175,000   175,000       $ 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   $ 2,800,000        
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 $ 189,000