Note 9 - Income Taxes - Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
State tax credits	$ 1,046	$ 1,000
Unfunded pension liability	1,102	605
Reserves and accruals	2,721	2,483
Federal, state and foreign net operating loss and credit carryforwards	8,042	8,370
Depreciation	686	850
Amortization	698
Lease accounting	3,961
Other accruals	5,079	5,641
Total deferred tax assets	23,335	18,949
Depreciation	1,901	1,666
Amortization	6,973	7,930
Lease accounting	3,871
Other accruals	370	893
Total deferred tax liabilities	13,115	10,489
Valuation allowance	8,216	9,200
Net deferred tax liabilities	$ 2,004
Net deferred tax assets		$ (740)