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Note 5 - Leases - Maturity of Lease Liabilities (Details) - USD ($)
Jun. 30, 2019
Jan. 01, 2019
Operating leases, remaining 2019 $ 447,000  
Finance leases, remaining 2019 213,000  
Total, remaining 2019 660,000  
Operating leases, 2020 858,000  
Finance leases, 2020 398,000  
Total, 2020 1,256,000  
Operating leases, 2021 722,000  
Finance leases, 2021 398,000  
Total, 2021 1,120,000  
Operating leases, 2022 726,000  
Finance leases, 2022 223,000  
Total, 2022 949,000  
Operating leases, 2023 738,000  
Finance leases, 2023 2,000  
Total, 2023 740,000  
Operating leases, thereafter 3,380,000  
Finance leases, thereafter  
Total, thereafter 3,380,000  
Operating leases, total lease payments 6,871,000  
Finance leases, total lease payments 1,234,000  
Total, total lease payments 8,105,000  
Operating leases, less: Interest (1,379,000)  
Finance leases, less: Interest (94,000)  
Total, less: Interest (1,473,000)  
Operating leases, present value of lease liabilities 5,492,000 $ 5,731,000
Finance leases, present value of lease liabilities 1,140,000  
Total, present value of lease liabilities $ 6,632,000