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Note 3 - Commitments and Contingent Liabilities (Details Textual) - USD ($)
9 Months Ended 12 Months Ended
Mar. 14, 2014
Sep. 30, 2016
Dec. 31, 2015
Mar. 31, 2014
Promissory Note [Member]        
Long-term Line of Credit   $ 0    
Line of Credit Facility, Maximum Borrowing Capacity       $ 7,000,000
Debt Instrument, Basis Spread on Variable Rate 0.15%      
Line of Credit Facility, Interest Rate at Period End   3.35%    
Operating Leases, Rent Expense   $ 2,409,000 $ 4,296,000  
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals   $ 1,699,000