Note 1 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Operating Segments	6
Number of Reportable Segments	1
Incremental Costs of Obtaining a Contract, Deferred During Period	$ 868,000	$ 828,000
Capitalized Contract Cost, Amortization	689,000	616,000
Operating Lease, Right-of-Use Asset	2,140,000		$ 2,308,000
Operating Lease, Liability, Total	2,186,000		2,351,000
Accrued Liabilities and Prepaid Expenses, Net			$ 43,000
Asset Impairment Charges, Total	0	0
Direct Operating Costs [Member]
Capitalized Contract Cost, Amortization	6,000	31,000
Selling, General and Administrative Expenses [Member]
Capitalized Contract Cost, Amortization	683,000	585,000
Capitalized Contract Cost, Impairment Loss	$ 21,000	$ 12,000
Minimum [Member]
Capitalized Contract Cost, Amortization Period	3 years
Maximum [Member]
Capitalized Contract Cost, Amortization Period	5 years