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Note 9 - Term Loan and Line of Credit Agreements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Dec. 20, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jul. 01, 2018
May 31, 2018
Dec. 31, 2017
Long-term Debt, Gross   $ 11,185,000   $ 11,185,000        
Restricted Cash and Cash Equivalents, Noncurrent, Total   $ 1,326,000   $ 1,326,000       $ 2,826,000
Long-term Debt, Weighted Average Interest Rate, over Time   5.35% 5.35% 5.35% 5.35%      
Home Savings Bank [Member]                
Repayments of Lines of Credit $ 9,100,000              
Line of Credit Facility, Maximum Borrowing Capacity             $ 5,000,000  
Line of Credit Facility, Amounts in Excess of, Subject to Borrowing Base             1,000,000  
Line of Credit, Current   $ 0   $ 0     $ 0  
Line of Credit Facility, Interest Rate at Period End   5.00%   5.00%        
Home Savings Bank [Member] | Subsequent Event [Member]                
Line of Credit Facility, Interest Rate at Period End           5.25%    
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   $ 11,185,000   $ 11,185,000       11,464,000
Debt Issuance Costs, Net, Total   163,000   163,000       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   $ 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