Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Financial Guarantee Insurance Contracts, Unearned Premium Revenue, Total	$ 70,831,000			$ 33,149,000
Unbilled Contracts Receivable	69,002,000			31,151,000
Advance Premium Received	1,829,000			1,998,000
Premium Deficiency Reserve	0			$ 0
Deferred Policy Acquisition Cost, Capitalization	4,373,000	$ 2,808,000
Deferred Policy Acquisition Costs, Amortization Expense, Total	1,431,000	$ 1,346,000
Operating Lease, Weighted Average Discount Rate, Percent			6.00%
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 391,000
Operating Lease, Liability, Total			$ 391,000
Deposits From Self-Insured Groups [Member]
Deposit Liability, Current	127,000
Self-insurance Premium [Member]
Accounts Receivable, before Allowance for Credit Loss	$ 433,000