Leases (Details 1) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases
Operating cash flows (fixed payments)	$ 140,000	$ 122,000	$ 352,000	$ 243,000
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows (liability reduction)	100,000	83,000	271,000	164,000
ROU assets obtained in exchange for lease obligations:
Operating leases	$ 0	$ 26,000	$ 14,000	$ 35,000