Note 12 - Commitments and Contingencies (Details Textual) - USD ($)		1 Months Ended	12 Months Ended	24 Months Ended
	Jan. 01, 2019	Jun. 30, 2015	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 2,400,000		$ 3,793,000	$ 3,793,000
Operating Lease, Liability, Total	2,400,000		4,381,000	4,381,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability			845,000
Cumulative Effect on Retained Earnings, Net of Tax, Total	$ 98,000
Self-insured Amount per Individual Claim		$ 50,000
Self-insured, Maximum Coverage Policy		$ 1,800,000
Self Insurance Reserve			68,000	68,000	60,000
Workers' Compensation, Maximum Coverage Policy					1,800,000
Workers' Compensation, Accumulated Payments on Claims					$ 1,800,000
Workers' Compensation, Estimated Accruals				1,600,000
Other Noncurrent Assets [Member]
Worker's Compensation, Prepaid Amount			$ 189,000	$ 189,000