Note 14 - ODFA Pooled Financing (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Other Non-Operating Income (Expense)		$ 42	$ 162	$ 324	$ 527
Oklahoma Development Finance Authority [Member]
Note Receivable Financing Agreement, Maximum Borrowing Capacity	$ 3,500
State Withholding Taxes Returned	$ 3,500
Financing Receivable, Gross		100		100		$ 500
Other Non-Operating Income (Expense)		$ 100	$ 200	$ 400	$ 500