Note 11 - Employee Benefit Program (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
BTC [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.50%	4.50%	6.00%
Defined Contribution Plan, Cost Recognized	$ 15,000	$ 15,000	$ 30,000
Defined Contribution Plan, Minimum Annual Contributions Per Employee, Percent	1.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 17,500	$ 17,500	$ 17,500
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.50%	4.50%	6.00%
Multiemployer Plan, Period Contributions	$ 0	$ 0	$ 0
Defined Contribution Plan, Cost Recognized	$ 520,000	$ 494,000	$ 670,000