Note 1 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jul. 31, 2020 USD ($)
Number of Operating Segments			6
Number of Reportable Segments			1
Incremental Costs of Obtaining a Contract, Deferred During Period	$ 717,000	$ 1,000,000.0	$ 2,900,000	$ 1,800,000
Capitalized Contract Cost, Net, Noncurrent	4,542,000		4,542,000		$ 4,204,000
Asset Impairment Charges, Total			0		0
Goodwill, Ending Balance	57,875,000		57,875,000		57,935,000
Sales and Excise Tax Payable					$ 775,000
Increase (Decrease) in Insurance Settlements Receivable			913,000	(0)
Cyber Attack [Member]
Proceeds from Insurance Settlement, Operating Activities			2,400,000
Increase (Decrease) in Insurance Settlements Receivable	913,000
Insurance Settlements Receivable to Be Reimbursed Directly to the Company	866,000		866,000
Insurance Recoveries	$ 533,000
Cyber Attack [Member] | The Insurer [Member]
Payments for Insurance Settlement, Paid Directly to Vendors			$ 400,000
WASHINGTON
Sales and Excise Tax Payable (Reversal of Liability)						$ (268,000)
Canadian Subsidiary [Member]
Number of Customers	1		1
Goodwill, Ending Balance	$ 2,300,000		$ 2,300,000
Customer Concentration Risk [Member] | Revenue from Contract with Customer Benchmark [Member]
Concentration Risk, Percentage			65.70%
Selling, General and Administrative Expenses [Member]
Capitalized Contract Cost, Impairment Loss	$ 20,000	$ 1,000	$ 25,000	$ 22,000
Minimum [Member]
Capitalized Contract Cost, Amortization Period (Year)	3 years		3 years
Maximum [Member]
Capitalized Contract Cost, Amortization Period (Year)	5 years		5 years