Assets and liabilities measured at fair value on a recurring basis are summarized below: (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets:
Available-for-sale securities	$ 146,373	$ 146,997
Marketable equity securities	6,309	6,237
Interest rate swaps	5,344	6,343
Liabilities:
Interest rate swaps	5,344	6,343
Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities
Marketable equity securities	6,309	6,237
Interest rate swaps
Liabilities:
Interest rate swaps
Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	146,373	146,997
Marketable equity securities
Interest rate swaps	5,344	6,343
Liabilities:
Interest rate swaps	5,344	6,343
Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities
Marketable equity securities
Interest rate swaps
Liabilities:
Interest rate swaps
Fair Value, Recurring [Member]
Assets:
Available-for-sale securities	146,373	146,997
Marketable equity securities	6,309	6,237
Interest rate swaps	5,344	6,343
Total assets	158,026	159,577
Liabilities:
Interest rate swaps	5,344	6,343
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Available-for-sale securities
Marketable equity securities	6,309	6,237
Interest rate swaps
Total assets	6,309	6,237
Liabilities:
Interest rate swaps
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Available-for-sale securities	146,373	146,997
Marketable equity securities
Interest rate swaps	5,344	6,343
Total assets	151,717	153,340
Liabilities:
Interest rate swaps	5,344	6,343
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Available-for-sale securities
Marketable equity securities
Interest rate swaps
Total assets
Liabilities:
Interest rate swaps