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Note 12 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
Future Minimum
 
Years Ending December 31,
 
Lease Payments
 
         
2018
  $
958,000
 
2019
   
615,000
 
2020
   
485,000
 
2021
   
456,000
 
2022
   
450,000
 
Thereafter
   
450,000
 
    $
3,414,000