Note 1 - Nature of Operations, Basis of Presentation and Company Conditions - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Cash and cash equivalents at beginning of period		$ 23,351	$ 2,635	$ 3,979
Restricted cash at beginning of period (1)	[1]		523	523
Cash, cash equivalents and restricted cash at beginning of period		23,351	3,158	4,502
Cash and cash equivalents at end of period		4,370	23,351	2,635
Restricted cash at end of period (1)	[1]	3,578		523
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD		$ 7,948	$ 23,351	$ 3,158

[1] Restrictions on cash at June 30, 2020 and June 30, 2019 relate to collateral for several bank-issued letters of credit for contract guaranties. Also included in the June 30, 2020 total is $2.3 million of restricted cash held in a cash bond in regards to disputed amounts with a subcontractor. The Company is working to settle the disputed amounts payable and the funds will release at such time to pay agreed amounts with any excess returning to the Company.